Osias Size Guide

At OSIAS, our clothing size chart is based on flat garment measurements, including key dimensions such as bust, waist, and hips. For some items, we also list shoulder width, garment length, and pant length to help you better understand the fit.

To make size selection easier and more accurate, we’ve introduced an AI-powered Size Recommendation feature. Simply enter your body measurements (e.g. bust, waist, hips), and choose your preferred fit:

• Loose

• Regular

• Fitted

Our system will suggest the most suitable size for that particular costume style—no more guessing!

If you're unsure or don’t receive a size recommendation, feel free to contact us. We're always happy to help you find the perfect fit.