Picking the right size online can be tough, so we’ve created the below charts to make it a whole lot easier. If you still have any questions, feel free to reach out to us at hello@buunderwear.com


Our underwear is made with fabric that is very soft and designed to stretch and retain its shape. We recommend going with the size you are closest to when buying leggings or tights. If you are an 8 but often fit into size 6 then go with XS. Similarly, if you are an 8 but sometimes fit a size 10, best to go with an S.


We wanted to make things easy for you, so we’ve tried to align our sizing with other big brands that you may be familiar with. If you own a similar style from another brand, you’ll be a similar size in BU Underwear.  

Our bras have 3 staggered back hooks, and adjustable straps to ensure you get the perfect fit. Our Fabric is stretchy and more of a fuller cup for extra support. If in-between sizes we recommend going up!

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