Do you remember the old-fashioned spencer? Perhaps it was a scratchy singlet or long-sleeve undershirt your mum insisted you wear on cold mornings.

Thankfully, thermals for women have come a long way.

Today’s thermal layers can be fine, soft and comfortable enough to disappear beneath your clothes, while some styles are polished enough to become part of the outfit itself. From sleeveless singlets to long-sleeve tops, polo necks and leggings, the basic idea behind the spencer remains surprisingly relevant: start with a comfortable layer close to the body, then build your outfit from there.

For women who want warmth without unnecessarily bulky dressing, the modern spencer deserves another look.

What Is a Ladies’ Spencer?

In Australia, the word spencer traditionally referred to a close-fitting sleeveless or long-sleeve undergarment worn beneath clothing for extra warmth.

You might also know it as a singlet, undershirt or thermal top.

The terminology has changed, but the principle hasn’t. Modern women’s thermal underwear still provides that useful first layer beneath your everyday clothes. What has changed considerably is the choice of fabrics, necklines and styles available.

At The Foundation, we tend to call these pieces thermals or layering pieces rather than spencers.

You’ll now find thermal singlets and tank tops, long-sleeve tops with different necklines, polo neck styles and thermal leggings. Depending on the fabric and finish, some tops are intended primarily as an underlayer while others can also work as visible clothing.

What Should You Look for in Thermals for Women?

The warmest or thickest thermal isn't automatically the most useful one.

For everyday dressing, a fine base layer can often be easier to incorporate into your wardrobe because it sits beneath knitwear, shirts, jackets and coats without adding excessive bulk.

Think about where and how you'll wear your thermals.

A sleeveless thermal singlet or tank gives you extra coverage through the body while leaving your arms free. It can be useful when you want another layer without putting two sets of sleeves beneath a jumper or jacket.

A long-sleeve thermal top gives you more coverage through the arms and torso and works well beneath winter clothing.

A polo neck thermal adds coverage around the neck and can also become a visible part of an outfit.

And thermal leggings extend your base layer to the lower body, making them useful beneath trousers or other winter outfits.

The aim is to choose pieces that complement the clothes you already wear rather than making winter dressing feel more complicated.

Which Fabric Should You Choose?

There isn't one thermal fabric that will suit every woman, outfit or temperature.

The Foundation's wider women's thermal collection includes options across cotton, modal, cashmere, wool and silk, so it helps to think about fabric alongside how you plan to layer.

Modal and cashmere

One of the modern alternatives to the traditional spencer is a fine modal and cashmere blend.

Selected The baseLINE thermal tops use a composition of 85% modal, 9% cashmere and 6% elastane. The resulting fabric is fine and lightweight, with stretch that allows it to follow the body's shape.

Because these particular modal-cashmere styles are sheer and lightweight, they're especially suited to layering. The fabric may also become more sheer when stretched, so this is worth considering when choosing how to wear them.

If you're interested in the differences between common thermal fabrics, our guide to modal vs cotton thermals for women explores those two options in more detail.

Cotton

Cotton is another familiar option for women who prefer a traditional natural-fibre layer.

The Foundation's thermal range includes cotton styles as well as cotton used alongside other fibres. A cotton singlet can provide a straightforward layer beneath everyday clothing, particularly if you prefer the familiar feel of cotton against the skin.

Wool and silk

Wool and silk also have a place in a thermal wardrobe, particularly when you want to explore different weights, fabric combinations and levels of coverage.

Rather than assuming one fibre is always “best”, consider the garment itself, your outfit and the conditions you'll be wearing it in.

Meet the Modern Modal-Cashmere Spencer

If there is one style that demonstrates just how far the old spencer has evolved, it's The baseLINE modal-cashmere range.

The TBL Modal Cashmere Long Sleeve Top Grey is an Italian-made thermal top made from 85% modal, 9% cashmere and 6% elastane. It has a fine, lightweight construction designed for layering and is also available within the range in different silhouettes and colours.

For less coverage through the arms, the TBL Modal Cashmere Tank Top takes the same modern-spencer idea into a sleeveless shape.

When you want more coverage around the neckline, a TBL Modal Cashmere Long Sleeve Polo Neck Top provides another layering option.

Rather than buying every thermal style, consider the gaps in your wardrobe. If you regularly wear shirts and blazers, a fine tank may be enough. If winter means knitwear and coats, a long-sleeve style could become the layer you reach for more often.

Product colours, sizes and availability can change, so check the current product pages when choosing your preferred style.

How to Layer Thermals Without Adding Too Much Bulk

Good layering doesn't mean wearing as many clothes as possible.

Start with the lightest layer close to your body. From there, add your normal clothing and outer layers according to the weather.

For example, you might wear:

• a thermal tank beneath a shirt and blazer
• a long-sleeve thermal beneath a knit
• a fine thermal beneath a winter jacket or coat
• a polo neck as a visible layer beneath a blazer
• thermal leggings beneath suitable winter clothing.

The advantage of beginning with a fine base layer is flexibility. You're adding another element to an outfit you already enjoy rather than completely changing how you dress.

If dresses and skirts are a regular part of your winter wardrobe, see our guide to wearing thermals under dresses and skirts for more specific layering ideas.

Can You Wear a Thermal Top as Clothing?

Sometimes, but check the individual garment.

Some thermal tops have enough coverage and a sufficiently refined finish to work as visible layers beneath jackets or cardigans.

Others are deliberately fine or sheer and work better as traditional undergarments.

The modal-cashmere styles highlighted above are fine and lightweight, and the catalogue specifically notes that they can become more sheer when stretched over the body. Adding a tank underneath can provide additional coverage.

This distinction matters when shopping online. Rather than assuming every thermal top can double as outerwear, look at the fabric, weight, neckline and product information first.

A Better Way to Think About the Spencer

The name may sound old-fashioned, but the idea behind the spencer was practical: put a useful layer between your skin and the rest of your clothes.

Modern thermals simply give us more choice in how to do it.

A fine singlet can sit beneath workwear. A long-sleeve top can add another layer beneath a favourite knit. A polo neck can become part of the outfit. And different fabrics allow you to choose the feel and weight that work for you.

So perhaps the spencer never really disappeared. It simply became softer, lighter and much easier to incorporate into a modern wardrobe.

Discover The baseLINE Thermals and find lightweight thermal foundations for everyday layering.

FAQs

1. What is a women's spencer?
   A spencer traditionally referred to a close-fitting singlet or long-sleeve undergarment worn beneath clothing for warmth. Today, similar garments are more commonly described as thermal tops, thermal underwear or base layers.
2. What types of thermals for women are available?
   Women's thermals include sleeveless singlets and tanks, long-sleeve tops, higher-neck or polo-neck tops and leggings. The best choice depends on the coverage you want and the clothing you'll wear over it.
3. Should women's thermals fit close to the body?
   Thermals are generally designed to sit relatively close to the body so they can layer beneath clothing. Always check the individual product's sizing and fit information rather than assuming every thermal range fits in the same way.
4. Can you wear women's thermals as normal tops?
   Some can work as visible tops or layers, while others are designed primarily as underwear. Fine modal-cashmere styles may be sheer, particularly when stretched, so check the individual garment information before wearing one as outerwear.
5. What is the difference between a thermal singlet and a long-sleeve thermal?
   A thermal singlet or tank provides an extra layer through the torso without adding sleeves. A long-sleeve thermal extends that coverage along the arms, making it useful when you want a more complete base layer beneath winter clothing.