Crepe is not one fabric; it’s a family, and the care rules diverge sharply between them. A polyester crepe dress will survive a cold machine wash on a delicate cycle; a silk crepe de chine will not, and can shrink three to five percent on its first soak. With Royal Ascot running from Tuesday 16 June to Saturday 20 June 2026, plus the wedding and garden party calendar that follows, this is the week to read the label properly before you steam, wash or pack anything.
Below is the fibre-by-fibre breakdown nobody on the high street will spell out for you, including the honest answer on whether a £180 Reiss crepe dress is worth the premium over a £45 polyester alternative.
First, decode the label: what ‘crepe’ actually means
Crepe describes a weave and a finish, not a fibre. The pebbly, matte surface is created by tightly twisted yarns, which is what gives the fabric its anti-cling drape and its quietly slimming visual depth (the texture absorbs rather than reflects light, which is precisely why it dominates occasionwear floors at Reiss, Whistles, Hobbs, Phase Eight and Me+Em). The fibre underneath the weave, however, is the thing that dictates how you wash it.
- Polyester crepe: the high street default. Durable, machine-washable on a cold delicate cycle, holds colour well, but traps heat and sheds microplastics in the wash.
- Silk crepe de chine: the premium benchmark. Breathable, fluid, expensive, and genuinely fragile when wet. Look for momme weight on the label; 14 to 19 momme is the sweet spot for an occasion dress.
- Viscose (or rayon) crepe de chine: the overlooked middle tier. Better breathability than polyester, better washability than silk in theory, but viscose loses up to 50% of its strength when wet, which means careless handling will distort the seams.
- Wool crepe: structured, matte, useful for cooler British days and tailored coatdresses. Dry clean only in almost every case.
- Stretch or scuba crepe: heavy bodycon weave, fine for cocktail dressing but too clingy and shiny for the Royal Enclosure.
Washing: what each crepe will actually tolerate
Polyester crepe
Cold wash, delicate cycle, inside a mesh laundry bag. Use a liquid detergent formulated for synthetics; powder can settle in the textured weave. Skip fabric softener entirely. Softener coats the twisted yarns with a waxy film that flattens the pebbly surface and kills the drape, which is the only reason you bought the dress in the first place. Hang to dry on a padded hanger, never tumble. If you wash polyester crepe regularly, a Guppyfriend bag catches the microfibre shedding that conscious-fashion readers are increasingly concerned about.
Silk crepe de chine
Hand wash only, in cool water (no warmer than 30°C), with a pH-neutral silk wash or a tiny amount of baby shampoo. Do not wring; press the water out between two clean towels. Expect three to five percent shrinkage on the first wash, which matters enormously if your dress is fitted at the waist or bust. If it’s a tailored Ascot piece you bought to size, take it to a specialist dry cleaner the first time and reserve home washing for low-stakes silk.
Viscose crepe
The trickiest. Hand wash in cool water with the absolute minimum of agitation, support the full weight of the wet garment when you lift it out (viscose stretches dramatically when waterlogged), and dry flat on a clean white towel. Never hang viscose crepe wet. A sudden British summer shower at Ascot is also a viscose problem worth knowing about in advance: water spots can mark the surface and require a full re-press to remove.
Steaming: the fibre-specific rule no one prints
Steam, don’t iron. Direct heat on any crepe permanently flattens the textured weave, and once that pebbly surface is pressed smooth, it doesn’t come back. If you must iron, do it on the wrong side, on the lowest setting, with a pressing cloth.
The steamer distance is where most damage happens:
- Silk crepe de chine: hold the steamer 15 to 20cm away from the fabric and keep it moving. Dwelling in one spot causes water spots that are very difficult to remove from silk, and on a pale dress they will read as permanent stains.
- Viscose crepe: same distance, same constant motion. Viscose is even more spot-prone than silk when damp.
- Polyester crepe: tolerates a closer pass (around 10cm) and forgives a brief dwell, but the seams can pucker if you over-steam at the waist or armhole.
A Pinterest pin featuring Silk Crepe de Chine fabric, illustrating the delicate, textured nature of crepe that makes careful washing and storage so essential.
Steam from the inside where possible, especially on dark colours, and let the dress hang for thirty minutes before you wear it so the moisture fully evaporates.
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The Reiss question: is £180 crepe worth it?
An honest answer. The Reiss frustration on Mumsnet and review platforms is consistent and fair: shoppers are paying £150 to £200 for what is often 95% polyester, and at that price point the fabric content alone doesn’t justify the spend. What you’re actually buying is the cut, the lining, the weight of the crepe (look for GSM on the spec sheet; 200 to 280 GSM tends to drape best) and the finish at the seams and hem.
For a six-hour day at Ascot’s Royal Enclosure in June heat, polyester crepe traps body heat in a way silk and viscose simply don’t. If you run warm or you’re standing in the sun by the parade ring for the afternoon, a silk-blend or viscose crepe dress from Cefinn, Suzannah London or a careful Hobbs piece will be physically more comfortable than the polyester equivalent. Sezane is regularly named on UK fashion forums as a natural-fibre alternative worth comparing.
The cost-per-wear maths is also worth doing properly. A £180 silk-blend dress, hand washed at home and worn ten times across five summers, lands at £3.60 a wear. A £45 polyester dress dry-cleaned four times a year at £18 a clean over two years before it pills lands at roughly £6 a wear. The numbers flip more often than you’d think.
Storage and packing: keep the drape alive
Hang crepe on a padded or wide wooden hanger, never wire. For long-term storage between summers, fold heavier wool or polyester crepe with acid-free tissue at the fold lines to prevent permanent creasing; hang silk and viscose crepe in a breathable cotton garment bag (never plastic, which traps moisture and yellows silk).
For an overnight stay before a wedding or race day:
- Polyester crepe: roll the dress loosely inside tissue paper rather than folding. Sharp creases set into polyester crepe and require a full steam to release.
- Silk crepe de chine: lay flat between layers of acid-free tissue, then fold once at the waist. Do not roll silk; the twist sets diagonal creases that are hard to steam out.
- Viscose crepe: tissue between every fold, and pack at the top of the suitcase so nothing presses it from above.
The Ascot benchmark, briefly
The Royal Ascot 2026 Handbook names silks as the fabric of the season, which makes a silk or silk-blend crepe dress not just practical for the weather but the editorially correct choice this year. Bright Tomato is Ascot’s first official Colour of the Year, drawn from current trend forecasting and brought to life in custom looks by British designers including Suzannah London, with racegoers encouraged to wear it on Gold Cup Day, Thursday 18 June. Catherine, Princess of Wales has anchored the crepe coatdress as a benchmark for polished British occasion-dressing for years (her returns to Emilia Wickstead tailoring in particular have made the silhouette a quiet standard), and the reason it works is the same reason it will work for you: the matte weave holds its line for six hours of standing, walking and sitting without crushing.
One concrete action this week: pull your dress out of the bag tonight, identify the fibre on the label, and steam it at the correct distance for that fibre. If it’s silk or viscose and the hem looks tight, take it to a dry cleaner on Monday rather than risking a home wash three days before the event. The drape you paid for is worth protecting.
