Please use this bra measurement guide below .
If you are on the lower end of the underbust sizing and prefer a tighter fit I would go down a underbust size the same being if you are in the process of loosing weight.
In regards to bust measurements if you are on the higher end of the sizing (on the verge of the next size) I would go for the size up.
All for all pants are based on the standard uk sizing system, if you need in between sizes please select one then write me a little note in the basket/checkout area what size you are. If there is no comment box for you please send me a little email.
hip measurement (around pant line) and your bum measurement (largest area) alongside your dress size is what I need to make your leggings/shorts.