We have seven sizes in all styles and colours of our period pants, ranging from XS (UK size 4-6) to 3XL (UK size 28-30). You can check out the size chart below if you’re after a full break down with measurements. The bikini brief comes up ever so slightly bigger so if you’re between sizes we'd suggest sizing down, but the high waist are very true to size. Personally, we LOVE opting for comfort on our periods so would be inclined to size up if I’m between sizes 💕