SIMKHAI Size Guide: US to UK Sizes and How the Brand Fits

SIMKHAI dresses are sized in US numbers from 00 to 14, and the brand’s own chart sets a US 00 as a UK 4, so most women take the US size that sits two numbers below their UK size: a UK 10 is a US 4. You can see every style on the SIMKHAI brand page, from dresses to knitwear and jackets, and the table below covers the full conversion.

Key facts

• SIMKHAI dresses are sized in US numbers from 00 to 14.
• On the SIMKHAI chart a US 00 is a UK 4, a US 4 is a UK 10 and a US 12 is a UK 18.
• SIMKHAI tops, knitwear and outerwear are sized in letters from XS to XL.
• The SIMKHAI Kimia Jacket is cut oversized; most other styles fit true to size.

SIMKHAI US to UK size conversion

This is the conversion SIMKHAI publishes for its dresses, skirts and anything else cut to a numeric size. It runs in even steps, so once you know one size you know them all.

Some dresses go up to a US 14 as well; check the size list on the product page for the style you want. If you are used to Australian sizing, it lines up with UK sizing for most purposes, so the same column applies.

Letter sizes: tops, knitwear and outerwear

Tops, knits, jackets and coats come in letters from XS to XL. A letter covers a wider range of bodies than a single number does, which suits the stretch in a knit and the ease built into a coat. Letters do not map one to one onto the numeric chart, so read the measurements on each product page rather than guessing from your dress size.

How SIMKHAI fits, category by category

Bustier and corset bodices

This is where sizing matters most. SIMKHAI builds a lot of its evening and day dresses on a structured bodice with boning, which is meant to sit close at the ribs and waist. Choose by your bust and waist measurements, not your hips; a bustier that gapes at the neckline is a size too big, and one that pinches under the arms is a size too small. The bustier midi dresses and the gowns follow the same rule.

Knits and knit dresses

The compact knits and taffeta knits are designed to skim the body. They have stretch, so if you sit between two sizes the smaller one usually holds its shape better through the day. Off-shoulder knits need a snug neckline to stay put, which is another reason to stay close rather than size up. Our SIMKHAI knitwear guide covers the fabrics.

Jackets and coats

Tailoring generally fits true to size with room for a fine knit underneath. A few pieces carry their own note: the Kimia Jacket is cut oversized, so take your usual size for the intended slouch and only size down if you want a neater line. If you plan to wear a chunky sweater under a coat, check the shoulder measurement first. See our SIMKHAI jackets and coats edit for the full range.

How to choose between two sizes

• Fitted bodices and bustiers: size to your bust and ribcage, then have the hem taken up if needed.
• Stretch knit dresses: take the smaller size if you sit between two.
• Relaxed tailoring and anything marked oversized: stay with your usual size.
• Bias and draped dresses: size to your hips, since the drape eases over the bust.
• Many pieces are Dry Clean Only, so do not count on a wash to relax a tight fit.

SIMKHAI cuts dresses in US sizes, and its own chart sets US 00 as a UK 4, so a US 2 is a UK 8 and a US 6 is a UK 12. Tops, knitwear and outerwear run in letters from XS to XL. Most pieces fit true to size; read the fit note on each product page, and see our SIMKHAI size guide for the full table.

Pieces to size with care

1. Viretta Knit Mini Dress in Black

The Viretta Knit Mini Dress is ecovero viscose and recycled nylon with real stretch, so it is one to take in your smaller size if you are between two.

2. Zurie Lace Bodysuit in Black

The Zurie Lace Bodysuit is polyester with spandex and fits close to the skin; size to your bust and it will sit flat under a skirt.

3. Maril Knit Organza Midi Dress in Fig

The Maril Knit Organza Midi Dress in fig has a fitted knit body, so choose by your ribcage and let the organza do the rest.

4. Kimia Jacket in Raven

The Kimia Jacket in Raven is the brand’s noted oversized cut. Your usual size gives the slouch it was designed with.

5. Rumi Belted Wool Coat in Midnight

The Rumi Belted Wool Coat in midnight is a wool blend with a belt, so it forgives a size either way; check the shoulder if you layer heavily.

6. Maeva Embellished Bustier Mini Dress in Black

The Maeva Embellished Bustier Mini Dress in black is the bustier rule in action: fit it to the bodice, not the hem.

For dresses by length, see SIMKHAI mini dresses and our wider SIMKHAI dresses guide, and browse every mini dress and coat on Coveti.

SIMKHAI at a glance

Frequently asked questions

Does SIMKHAI run small?

Most SIMKHAI styles fit true to size. Bustier and corset bodices fit close by design, so size to your bust and waist measurements.

What UK size is a SIMKHAI US 4?

A SIMKHAI US 4 is a UK 10. The brand’s chart sets US 00 as a UK 4 and climbs in even steps from there.

What UK size is a SIMKHAI US 0?

A SIMKHAI US 0 is a UK 6, and a US 00 is a UK 4.

Are SIMKHAI knits sized in letters?

Yes. Tops, knitwear and outerwear come in XS to XL, while dresses use US numeric sizes.

Is the SIMKHAI Kimia Jacket oversized?

Yes, the Kimia Jacket is cut oversized, so take your usual size for the relaxed fit it was designed with.

Read next: Where to buy SIMKHAI, SIMKHAI midi dresses, Is SIMKHAI worth it?.

By Gemma Deeks, Coveti Fashion Editor. Updated 21 October 2026.