Does Oscar de la Renta Run Small? Size Guide and US to UK Chart

By Gemma Deeks, Coveti Fashion Editor. Updated 14 October 2026.

Does Oscar de la Renta run small? No. The house gives no general sizing correction, so most customers take their usual size. The fitted evening pieces are the exception to watch: structured faille and embroidered dresses have little give at the waist and bust, so choose those by your largest measurement. Oscar de la Renta uses US sizes. To find your UK size, add four: a US 2 is a UK 6, a US 6 is a UK 10 and a US 12 is a UK 16. Knits and some separates use letter sizes from XXS to XXL. Coveti shows every Oscar de la Renta piece in UK sizes, so you do not need to convert.

At a glance

• Numeric: US sizes, usually US 0 to US 14 and 16 depending on the style.
• Conversion: UK = US + 4. EU = US + 30. Italian = US + 36.
• Letters: knitwear and some tops run XXS to XXL.
• Fit: the house gives no general correction, so take your usual size.
• Jewellery: one size. Check whether earrings are clip-on and post-back.

US to UK conversion chart

This is the standard conversion for women’s dress sizes. Coveti lists the UK size on every product page.

How the different pieces fit

Gowns and cocktail dresses. Structured faille and embroidered pieces have little give, so choose by your waist and bust and have the hem adjusted. Pieces with a fitted bodice and a full skirt are the most forgiving at the hip.

Day dresses. Poplin and wool day dresses are cut close but not tight. Take your usual size.

Knitwear. The wool, silk and cashmere knits have stretch, so if you are between letter sizes, take the smaller for a close line and the larger to layer.

Caftans. Caftans and relaxed styles are cut loose, so most customers size down.

How to measure yourself

Measure over light underwear with a soft tape held level. Bust: around the fullest part. Waist: around the narrowest part, usually just above the navel. Hip: around the fullest part of the seat, about 20 cm below the waist. Compare the numbers with the size chart on the product page, and size to the largest measurement for fitted evening pieces, since a waist can be taken in but rarely let out.

Between sizes

For gowns and structured cocktail dresses, take the larger size and have it tailored. For knitwear, take the smaller size for a close fit. For caftans and relaxed shapes, take the smaller size. If you are still unsure, contact Coveti customer care before you order.

Start with the essentials

If you are new to the house, the permanent knit essentials are the easiest way to learn your size, because the fit stays the same each season.

1. Essential: Wool-Blend Bolero in Ivory

60% Wool, 30% Silk, 10% Cashmere. A permanent-collection knit in wool, silk and cashmere that layers over everything. Wear it over dresses and tailoring alike.

2. Essential: Wool-Blend Cardigan in Black

60% Wool, 30% Silk, 10% Cashmere. It is part of the permanent collection, knitted from wool, silk and cashmere and reissued each season. It pairs with the house’s skirts and trousers.

3. Essential: Wide-Leg Wool-Blend Pant in Black

95% Wool, 5% Elastane. The wool is light and holds its shape through the day. It mixes with tailoring and denim.

4. Essential: Wool-Blend Tank in Black

60% Wool, 30% Silk, 10% Cashmere. A permanent-collection knit in wool, silk and cashmere that layers over everything. It mixes with tailoring and denim.

Jewellery and bags

Jewellery and bags are one size. On earrings, check the closure line on the product page: many Oscar de la Renta earrings are clip-on for non-pierced ears and some have post backs. See Oscar de la Renta earrings.

Frequently asked questions

Does Oscar de la Renta run small?

The house gives no general sizing correction, so most customers take their usual US size. Structured evening pieces leave little room at the waist.

What is a US 4 in UK sizes?

A US 4 is a UK 8.

What size is a US 0 in the UK?

A US 0 is a UK 4.

What is XS in Oscar de la Renta?

XS is roughly a US 2, which is a UK 6. Check the size chart on the product page for knits.

Does Coveti show UK sizes for Oscar de la Renta?

Yes. Every product page lists the sizes on the UK ladder, converted from the house’s US sizes.

Read next

Oscar de la Renta dresses | Oscar de la Renta knitwear | Oscar de la Renta earrings | Oscar de la Renta Ready-to-Wear | Oscar de la Renta Cocktail Dresses | Shop all Oscar de la Renta at Coveti