Does the Brand I Saw It First Run Big or Small? What Is Their Sizing Like?

Known for fast fashion at affordable prices, I Saw It First is a go-to for trend-led styles, celebrity-inspired outfits, and last-minute partywear. But if you’ve ever ordered from them, you might’ve wondered: does I Saw It First run big or small? Is the sizing reliable, or should you size up or down to get it right?

Let’s be honest — fast fashion sizing can be unpredictable. That’s exactly why Tellar.co.uk exists.

At Tellar.co.uk, we’ve analysed every single brand’s size data, including I Saw It First, and we match it to your unique body measurements.

You get access to your correct size in 1,500+ brands, any time you shop.

🧵 One-time setup. Always free to use. No catches. We’ll even send you a free measuring tape.

With Tellar, you never need to check a size chart again.

👉 Click here to find your I Saw It First size now

---

At a Glance: Does I Saw It First Run Big or Small?

Most reviews — and our size data analysis — indicate that:

• I Saw It First clothing runs true to size in most cases, with occasional inconsistencies.

• Tops, bodycon dresses, and activewear can feel snug, especially for bustier or curvier body types.

• Fabric plays a huge role: stretch fabrics run true to size or even generous, while non-stretch woven items often run small.

• In some cases, sizing varies between collections — especially collabs or ‘premium’ ranges.

💡 If you're shopping between sizes or unsure about a product cut, Tellar gives you a tailored size match based on your actual body measurements.

🔗 Related brand sizing posts:

• Does Boohoo run small?

• PrettyLittleThing size guide

• Missguided sizing breakdown

---

I Saw It First Sizing Chart vs Real Fit

The official size guide on their website looks like this:

But in reality, the fit depends heavily on the fabric, cut, and batch production. Our analysis from customer data shows:

• Jersey-based items (like ruched bodycons or wrap dresses) = true to size or slightly large

• Satin, PU, or woven fabrics = tend to run tight

• High-waisted trousers and corset tops = often come up small at the waist

🎯 Want your size matched to the specific product fit and fabric?

Try Tellar’s free size tool here and get real-time recommendations.

---

Common Fit Issues With I Saw It First

1. Shorter Inseams and Crop Lengths

Tops, skirts, and jumpsuits often run short — not just in length but in rise. This can be especially frustrating if you're:

• Long in the torso

• Above 5'7"

• Looking for coverage in office or daywear styles

🛍 Check out how this compares with H&M and Zara sizing

---

2. Sleeve and Shoulder Fit

Slim cut arms and narrow shoulder seams are a recurring theme in:

• Long-sleeved bodysuits

• Corset-style blouses

• Structured jackets

If you’re broad-shouldered or between sizes, sizing up is often more comfortable — especially with non-stretch material.

💬 “I loved the blazer but couldn’t lift my arms — had to go a full size up for comfort.”

— Trustpilot review, 2024

---

3. Trousers and Joggers

Bottoms vary a lot. Many are elasticated or drawstring waist, which helps. But the issue isn’t always waistband — it’s tightness on the hips and thighs.

🩳 Try Tellar’s brand matcher to compare I Saw It First with:

• Shein

• ASOS

• Nasty Gal

---

Popular Categories: What’s Worth Buying?

1. Party Dresses & Going Outwear

• Affordable, trendy, and updated weekly

• Bodycon fits can be snug — Tellar sizing ensures better accuracy before you check out

• Ruched, wrap, and knit styles are the most forgiving for different body shapes

2. Loungewear & Tracksuits

• Oversized fits available — but check fabric content

• Some sets are boxy; others run tight on legs

• Use Tellar’s unit-specific measurements to get joggers and leggings right in either CM or inches

3. Blazers and Co-ords

• Blazers tend to run slightly small in the arms, especially if double-breasted

• Great value for price, but size precision is key for shoulder seams

🎯 Avoid return hassles by using Tellar’s free profile tool to check your size in seconds.

---

Why Use Tellar for I Saw It First?

Because fast fashion sizing changes — and guessing doesn't work.

At Tellar.co.uk, we’ve built the UK’s smartest free size-matching tool.

✅ We analyse every brand’s size chart and real-life fit feedback

✅ We match your profile to the best size in over 1,500 brands

✅ You can shop knowing your measurements are already factored in

✅ We even send you a free measuring tape

✅ Once you set up your profile, it works for every future shop visit — always free

---

Compare Sizing: I Saw It First vs Other Fast Fashion Brands

👉 Read more brand comparison posts here

---

Follow Tellar.co.uk for Fit Help and Style Tips

Stay up to date with our sizing insights and brand breakdowns on socials:

• 📍 Instagram: @Tellarsizing

• 🐦 Twitter/X: @Tellar100

• 📌 Pinterest: TellarUK

• 👍 Facebook: TellarSizing

---

Final Thoughts: Is I Saw It First True to Size?

Mostly, yes — but with caveats.

I Saw It First generally runs true to UK sizing, but fit varies across categories. Always check the fabric, length, and cut. Shorter lengths, tighter bust fits, and narrow waists are common issues.

If you're curvier, taller, or in between sizes, don’t rely on luck or vague size charts.

🎯 Let Tellar.co.uk match you exactly — based on your body measurements and the latest size data.

---

👉 Start now — Create your free profile on Tellar

🎁 Includes a free measuring tape.

✅ One-time setup. Always free.

👗 Shop I Saw It First and 1,500+ other brands without ever checking a size chart again.

---