Please note: This is a general size guide. Each item has its own detailed size chart—check individual product listings for specific measurements. Every body is unique, and our pieces vary in fit due to fabric, cut, and construction. Whether to size up or down depends on your personal fit preference. As a general guide, most designs feature a fitted waist (non-stretchy) and a smocked back at the bust for comfort but also some of design has no stretch so please take note. Always refer to the individual product page for the most accurate sizing information for your chosen piece.

General Size Guide of The Mad Theories:
Do note: UK sizing is an estimate. As it varies across different brands, it is important to check your bust and waist measurement to make ensure you get the correct size. 

Please note that all measurements are taken flat on the ground without stretch. 
If you're unsure on how to measure yourself, please see this video here to learn more. 

Understanding your body shape helps you find the best fit. Body shapes vary widely, and identifying yours accurately ensures you select styles that complement your proportions. If you're uncertain about your body shape, you can use this resource to input your measurements and determine your shape type. Here is a reference photo of the different type of body shapes. 

If you're still unsure, please do reach out to us in the chat box.