Nightwear Fabrics Compared: Cotton, Modal and Microfibre

Quick answer

For most sleepers, cotton is the best fabric for pyjamas when breathability matters most. Modal is the better pick when you want a soft, fluid feel that moves with you. Microfibre sleepwear wins when you want a smooth, sculpting layer that stays invisible under clothing. DIM offers all three, so the right choice depends on whether you prioritise airflow, drape or a streamlined look.

Nightwear fabric comparison usually comes down to three names: cotton, modal and microfibre. Each behaves differently against your skin, which changes how you sleep and how you care for the garment. The goal is not to crown one winner but to match the fabric to your nights.

DIM uses these materials across pyjama sets, leggings and shaping pieces. Below we compare them on breathability, stretch, care and fit, using real DIM products as examples so you can see how the choice plays out in practice.

Cotton: breathable nightwear with a crisp, dry hand

Cotton is the classic choice for breathable nightwear. It lets air circulate and feels dry against the skin, which suits warm sleepers and anyone who runs hot. DIM's Pyjama long ouvert unisexe en toile de coton bleu à rayures uses a cotton canvas with a shirt-style jacket, chest pocket and drawstring trousers. The open, buttoned front adds ventilation, and the unisex cut keeps the fit relaxed rather than clingy.

The trade-off is that cotton has less stretch than modal or microfibre. It creases more and can feel firmer at first, softening over time. If you want a pyjama that stays crisp and structured, that is a feature; if you want a second-skin feel, it is a limitation.

• Choose cotton if you overheat at night or prefer a dry, non-clinging feel.
• Wash cotton at moderate temperatures and avoid over-drying to limit shrinkage.

Modal: soft drape and easy movement

Modal is a semi-synthetic fibre prized for a fluid, cosy hand. DIM's Cycliste femme en modal polyamide côtelée Beige Ivoire Dim Icons Seamless shows what that means in practice: a ribbed modal-polyamide blend with a seamless construction and a black DIM stripe at the waist. The fabric follows your body without pinching, which makes it a strong pick for lounging and warm-weather sleep.

Compared with cotton, modal typically feels smoother and drapes more closely. It also tends to hold its shape well. The trade-off is that it can feel less airy than open-weave cotton, and the close fit means you may want to size up if you prefer a loose sleep layer.

• Best for sleepers who want a soft, second-skin feel without compression.
• The seamless build reduces bulk under pyjamas or loungewear.

Microfibre: smooth, sculpting and invisible under clothes

Microfibre sleepwear and shaping pieces use fine synthetic fibres to create a smooth, stretchy surface. DIM's Body string effet sculptant en microfibre Nude Dim Silhouette Invisible is a body-string with underwiring that targets the stomach and waist, while the Panty gainant femme en microfibre sans couture Nude Dim Silhouette Invisible is a high-waisted short that targets the stomach, waist, thighs and hips. Both are designed to stay invisible under clothing.

The trade-off is breathability. Microfibre is less airy than cotton, so it suits specific moments: under an outfit, for a streamlined look, or for cool nights when warmth is welcome. It is not the first choice if you overheat easily or want maximum airflow.

• Use microfibre when you want a smooth silhouette under clothing, not as your main hot-weather sleep layer.
• The seamless, high-waist construction reduces visible lines.

Care and longevity: what each fabric asks of you

Cotton is the most forgiving: it handles regular washing and tolerates a warm iron. Modal blends like the ribbed cycliste keep their softness with gentle cycles and low heat. Microfibre shaping pieces are the most delicate; they rely on stretch and seamless edges, so high heat and harsh detergents can shorten their life.

A simple rule: wash all three inside out, skip fabric softener on microfibre, and air-dry when you can. That keeps cotton crisp, modal smooth and microfibre elastic for longer.

• Air-dry microfibre to protect stretch and seamless edges.
• Wash modal and microfibre on a gentle cycle to preserve the hand feel.

Trade-offs to weigh before you choose

• Breathability vs. smoothness: Cotton canvas lets the most air through, while microfibre gives the smoothest, most invisible surface. Modal sits between them with a soft drape. Pick cotton for hot sleepers, microfibre for outfit-smoothing, modal for a balance of both.
• Stretch vs. structure: Modal and microfibre stretch and recover; cotton holds a crisper shape with less give. DIM's cotton pyjama uses a drawstring to adjust fit, while the modal cycliste relies on seamless stretch. If you want a relaxed, adjustable fit, cotton plus a drawstring is the safer bet.
• Care effort vs. longevity: Cotton tolerates warm washing and ironing. Modal prefers gentle cycles. Microfibre shaping pieces need low heat and no softener to keep their stretch and seamless edges. Match your laundry habits to the fabric, or the garment will lose its intended feel.

DIM fabric examples at a glance

• Pyjama long ouvert unisexe en toile de coton bleu à rayures: Long unisex cotton-canvas pyjama with a fully open button-front jacket, chest pocket and drawstring trousers with side pockets. The open front and cotton canvas make this the most breathable option here, and the adjustable drawstring helps you dial in the fit.
• Cycliste femme en modal polyamide côtelée Beige Ivoire Dim Icons Seamless: Seamless short legging in ribbed modal-polyamide with a black DIM stripe at the waist, described as cosy and ideal for warm days. Modal gives a soft, fluid feel with a seamless build, so it works for lounging and sleeping without bulk.
• Body string effet sculptant sculptant en microfibre Nude Dim Silhouette Invisible: Underwired body-string in microfibre with medium shaping that targets the stomach and waist and is designed to stay invisible under clothing. Best when you want a smooth silhouette under an outfit, not as a primary breathable sleep layer.
• Panty gainant femme en microfibre sans couture Nude Dim Silhouette Invisible: High-waisted seamless microfibre short with medium shaping that targets the stomach, waist, thighs and hips and stays invisible under clothing. The high waist and seamless finish make it a practical shaping layer for specific outfits rather than everyday hot-weather sleepwear.

How to decide

Best for

• Hot sleepers who want breathable nightwear and a dry feel (cotton)
• Anyone who wants a soft, fluid layer for lounging or warm nights (modal)
• People who need a smooth, sculpting layer under clothing (microfibre)

Not for

• Sleepers who overheat easily and want maximum airflow (avoid microfibre as a main sleep layer)
• Those who prefer a crisp, structured pyjama (modal and microfibre feel closer to the body)
• Anyone who wants zero care effort (microfibre needs gentle washing to last)

There is no single best fabric for pyjamas, only the best match for your nights. Choose cotton for breathability, modal for soft drape, and microfibre for a smooth, invisible layer. DIM's range lets you combine them, so you can sleep cool and still get the silhouette you want when it matters.