Osias Size Guide

The Perfect Fit Guide 📏

Forget "sizing up 3 times." We engineered our costumes for real bodies.

The "Golden Rule"

Stop guessing. Start measuring.

Cosplay costumes fit differently than your daily hoodie. Most of our premium fabrics (uniform cloth, jacquard) do not stretch. To get that "canon" look, match your measurements, not your ego.

  • Shoulder Width: Measure across your back from shoulder tip to shoulder tip.
  • Bust/Chest: Measure around the fullest part. (Not your bra size!)
  • Waist: Narrowest part of your torso. Critical for skirts/pants.
  • Hips: Fullest part of your hips/glutes.
💡 Pro Tip: If you are between sizes, always SIZE UP. It's easier to take a costume in with a safety pin than to magically grow more fabric.

Which Chart Should I Use?

Check the Product Label or description to see if the item is "US/EU Sizing" or "Asian Sizing".

🅰️ Standard US / EU Sizing (Western Fit)

True-to-size fit designed for Western bone structures. No need to size up.

OSIAS Size US Size Shoulder (cm) Chest (cm) Waist (cm) Hip (cm)
S 2/4 38 85 66 92
M 6/8 39.5 91 72 98
L 10/12 41.5 97 78 104
XL 14/16 43 103 84 110
XXL 18/20 44.5 111 92 120

🅱️ Asian Sizing (Petite Fit)

Runs smaller. We recommend sizing up 1-2 sizes compared to US brands.

Size Shoulder (cm) Chest (cm) Waist (cm) Hip (cm)
XS 38 84 64 88
S 39 88 68 92
M 40 92 72 96
L 41.5 96 76 100
XL 43 100 80 106
XXL 44.5 104 84 110

👨 Men's Standard Sizing

True-to-size US fit with broader shoulders.

Size Shoulder (cm) Chest (cm) Waist (cm) Hip (cm)
S 44 92 76 92
M 46 100 84 98
L 48 106 90 104
XL 50 114 98 112
XXL 52 122 106 120

Frequently Asked Questions

I am usually a Medium in Zara/H&M. What size am I?

If the product is marked "US Sizing", our Medium (US 6/8) is a perfect match. If it is "Asian Sizing", you will likely need a Large or XL.

My Bust is Medium but my Waist is Large. What do I do?

Always fit to your largest measurement. For dresses/jackets, prioritize Bust/Shoulder. For pants/skirts, prioritize Waist.

Do you offer custom sizing?

Currently, we focus on ready-to-ship sizes to get your gear to you fast. We do not offer custom tailoring at this time.