What’s My Clothes Size at Reiss? Does Reiss Run Big or Small?

Reiss is one of the UK’s most iconic premium fashion brands, renowned for sleek tailoring, elevated basics, and modern occasionwear. Whether you're shopping for a double-breasted blazer, a statement dress, or sharp trousers, Reiss delivers timeless design with a luxury feel.

But when it comes to sizing, things aren’t always so refined. Many customers are left wondering:

Does Reiss run big or small?

Why do some dresses feel perfect, while others are uncomfortably snug?

This post breaks down everything you need to know about Reiss sizing—and introduces Tellar.co.uk, the UK’s leading free sizing tool that gets your size right in seconds based on your exact measurements.

Does Reiss Run Big or Small?

Reiss typically runs small, especially in fitted garments like dresses, blazers and trousers.

It’s a brand that leans into slim tailoring and European-inspired silhouettes, so shoppers often find that their usual high-street size feels tighter in Reiss. This is especially true for:

Structured dresses
Blouses with narrow shoulders
High-waisted trousers
Blazers and fitted coats

If you’re between sizes or curvier in the hips or bust, you may need to size up.

Reiss Sizing Philosophy

Reiss sizing reflects a premium aesthetic rooted in precision tailoring. This means:

Less room is built in for ease or comfort
Slim fits are prioritised over relaxed shapes
Patterns are cut for elongated, straight figures
Stretch fabrics are used selectively—not universally

As a result, sizing accuracy becomes crucial. The label may say UK 10, but if the waist measures only 69cm and the hips just 94cm, it can feel much more like a tight 8 on curvier bodies.

Common Fit Observations by Category

Garment Type	Fit Style	Sizing Recommendation
Dresses	Tailored and structured	Often size up if curvy
Knitwear	Slim, fitted	True to size or size up for comfort
Blouses & Shirts	Narrow at shoulders	Size up if broad-shouldered
Trousers	Fitted waist, tapered	Size up for hip room
Blazers	Tailored through torso	May need to size up for bust
Coats	Structured, mid-weight	Stick to size unless layering

The Problem With Static Size Charts

Reiss’s size chart looks something like this:

UK Size	Bust (cm)	Waist (cm)	Hips (cm)
6	80	62	86
8	84	66	90
10	88	70	94
12	92	74	98
14	97	79	103

But these numbers don’t reflect:

How close to the body a garment is cut
Fabric stretch (or lack of it)
Where the garment is most fitted (bust, waist, hips)
Whether you're long- or short-waisted, or curvier in one area

That’s why many shoppers over-order—or worse, order the wrong size altogether.

Tellar.co.uk: Your Reiss Sizing Answer

Tellar.co.uk eliminates the uncertainty. It’s a free, real-time sizing tool that uses your exact body measurements to match you to your perfect Reiss size.

Instead of relying on generic charts, Tellar factors in:

Your shape
The garment category
The cut and fabric of the Reiss item

You get instant, data-backed sizing tailored to you—not the average shopper.

How It Works

Go to www.Tellar.co.uk
Create your free profile (takes under a minute)
Enter your bust, waist, and hips (in cm or inches)
Select Reiss from the brand dropdown
View your real-time size across dresses, trousers, coats and more

Why Tellar Is Perfect for Reiss Shoppers

✅ Designed for Tailored Brands

Reiss garments are cut close to the body—Tellar knows exactly how to adjust for that.

✅ Garment-Specific Logic

A size 12 blouse and size 12 blazer aren’t cut the same—Tellar takes that into account.

✅ Proportion-Based Matching

Your size is based on your largest relevant measurement—hips for trousers, bust for shirts, etc.

✅ One-Time Setup

Enter your measurements once and use them forever across 1,500+ brands.

✅ Completely Free

No sign-up fees. No subscriptions. No paywalls.

Example: UK Size 12 Shopper

Measurements:

Bust: 91cm
Waist: 73cm
Hips: 101cm

Tellar might recommend:

Reiss knit jumper: UK 12 (true to size)
Reiss fitted dress: UK 14 (cut tightly at bust and waist)
Reiss trousers: UK 14 (tailored, tapered cut)
Reiss oversized shirt: UK 12 (more relaxed fit)

Each result is explained based on fabric and fit—so you know why that size was chosen.

Not Just for Reiss

With your Tellar profile, you can also see your correct size in:

Massimo Dutti
COS
Zara
Mango
Jigsaw
Whistles
& Other Stories
H&M
…and 1,500+ more.

Each brand is built differently. Tellar unifies them around your body.

Why Guessing Doesn’t Work for Premium Brands

When buying high-end, tailored garments like Reiss, accurate sizing is essential. Guessing wrong doesn’t just waste time—it risks missing out on limited stock, ruining the silhouette, or wasting money on returns.

Tellar.co.uk solves that permanently. You’ll never need to cross-check charts or gamble between sizes again.

Final Thoughts

Reiss sizing runs small, especially in fitted, structured garments. While the quality and cut are exceptional, sizing accuracy is essential for the perfect fit.

With Tellar.co.uk, you no longer have to rely on guesswork. Just enter your measurements once, and Tellar matches you to your correct Reiss size instantly—and explains why it fits.

“Find your size in 1,500+ brands real-time. It’s Free & Easy.”

Try it now:

👉 Create your free profile

👉 Log in anytime to view your size instantly

Instagram: @Tellarsizing

Pinterest: TellarSizing

Twitter (X): @TellarSizing

Facebook: TellarSizing