Seraphine Sizing Guide: How to Find Your Perfect Fit and What’s Worth Buying

When it comes to maternity and postnatal fashion, Seraphine is one of the most trusted names in the industry. Worn by celebrities and royals alike (yes, even Kate Middleton), Seraphine blends comfort, style, and practicality for modern motherhood. But maternity sizing can be a minefield — especially with your body constantly changing shape.

If you're unsure what Seraphine size to buy, you're not alone. This guide will help you navigate Seraphine’s unique sizing system, highlight the styles worth buying, and show you how Tellar.co.uk can match your measurements to the perfect size across Seraphine and 1,500+ other brands.

Why Seraphine Sizing Is Different (and Sometimes Confusing)

Seraphine claims to stick to pre-pregnancy sizing — in theory, you wear your normal size while pregnant. But in practice, many shoppers find Seraphine garments run:

Small in the bust (especially with nursing features)
Generous in the bump and hips
Inconsistent across categories like jeans, knits, and dresses

Add in different collections — from nursing bras to occasionwear — and the challenge gets real. That’s where Tellar.co.uk’s free sizing tool is invaluable.

How to Measure Your Changing Body

With pregnancy or postpartum shopping, you need accurate, up-to-date measurements. Don’t rely on old pre-pregnancy numbers or guesswork. Use a soft tape measure and measure:

Bust

Measure around the fullest part of your bust. Seraphine tops and dresses often need extra room here, especially in months 6–9.

Underbust

Especially important for nursing bras and fitted camisoles.

Waist

Measure just above your bump or natural waistline if postpartum. Maternity jeans and leggings often have stretchy bands designed to sit above this.

Hips

Essential for fitted dresses, skirts, and postpartum trousers. Measure around the fullest part of your hips and bum.

🎁 Need a tape measure? Order your free one from Tellar — we’ll post it anywhere in the UK.

Seraphine Sizing Guide by Category

💃 Dresses (Everyday, Nursing & Occasion)

Seraphine’s maternity dresses are designed to grow with your bump. Stick to your usual UK size, but size up if you have a larger bust or are in your third trimester.

Tellar’s sizing tool automatically adjusts for gestational stage and body shape — simply enter your measurements to get the ideal match.

👖 Jeans & Leggings

Seraphine offers both over-bump and under-bump jeans. Most are fitted through the legs with high-stretch materials.

If you’re between sizes: size up
For over-bump styles: measure underbust and hips
For under-bump: measure low waist and hips

Let Tellar compare these fits with jeans brands you already wear.

👕 Tops & Knitwear

True to size, but tighter fits near the chest. Postnatal nursing tops often run small — size up for comfort during breastfeeding.

🧥 Coats & Outerwear

Maternity coats are roomy — but watch sleeve length and shoulder width. Tellar uses body-to-garment ratios to recommend whether to size up for layering.

Sample Size Conversion Chart (Estimates)

UK Size	Bust (cm)	Waist (cm)	Hips (cm)	Likely Seraphine Fit
6	80–84	63–66	86–90	XS
8	85–89	67–70	91–94	S
10	90–94	71–74	95–99	M
12	95–99	75–79	100–104	M-L
14	100–104	80–84	105–109	L

📌 Actual fit may vary by trimester, style, and fabric. Use our size tool for trimester-specific accuracy.

Best Seraphine Pieces to Buy

1. The Kensington Coat

A luxury wool maternity coat with zip-out panel — ideal for bump-to-baby use. Size down if in-between sizes.

2. Maternity Jeans

Seraphine’s denim line is well-reviewed for comfort. Look for side panel or over-bump options depending on your trimester.

Top tip: If you wore Topshop or Levi’s before, Tellar will cross-match your old size to Seraphine’s fit.

3. Nursing Dresses

Soft, stretchy, and cleverly designed for discrete feeding. Most styles run true to size, but nursing access cuts small in the chest — size up for comfort.

4. Occasionwear

If you’re attending a wedding or special event, Seraphine’s occasion dresses are bump-friendly and flattering. Wrap and empire styles are most flexible in sizing.

5. 4th Trimester Loungewear

Postpartum joggers, wraps and robe sets are ideal for recovery. Look for elastic waistbands and jersey fabrics. True to size — but use your post-birth waist/hip when checking.

How Tellar.co.uk Takes the Guesswork Out of Maternity Sizing

With so many variables (pre-bump, mid-bump, postpartum), maternity sizing is one of the hardest to shop — and that’s why Tellar exists.

Our platform helps you:

👶 Match your body’s current size to 1,500+ brands
🛍️ Compare sizing across Seraphine, H&M Maternity, ASOS Maternity, and more
📏 Update your profile as your body changes
🧠 Get intelligent recommendations based on bust/waist/hip ratios, not just labels

🖱️ Create your free sizing profile here and join thousands of UK women shopping smarter during pregnancy.

Start Your Free Size Match at Tellar.co.uk

Step 1: Log in or sign up

Step 2: Add your measurements or last-known sizes

Step 3: Get your Seraphine size and compare across maternity brands

Step 4: Request a free measuring tape if you don’t have one yet

Follow Tellar for More Tips & Maternity Fit Advice

Instagram: @Tellarsizing
Pinterest: TellarSizing
Facebook: TellarSizing
Twitter (X): @TellarSizing

Final Thoughts: Shop Seraphine with Confidence

Seraphine designs beautiful, functional maternitywear — but the wrong size can make you feel uncomfortable and unsupported during a time when your body deserves better.

🧵 Let Tellar.co.uk do the sizing for you.

Find your size in 1,500+ brands real-time. It’s free & easy.