Adored this set but I’m a standard UK10 and always take a medium in everything but with these I’d size down if you can. When I tried them on there was the tiniest bit of gaping at the back but they fit me nice and comfortably so I didn’t worry too much. I forgot that they’re not yoga shorts and that might change when wet though! When walking out through the white water the waves would pull the waist down so I’d have to keep pulling them up all the time. Very frustrating but I’m going to see if I can get them taken in because I LOVED this set and wore it so much on my surf trip! Also really nice for sitting in beach bars so you’re not too exposed!