We are unable to advise exact compatible US/UK sizing since each brand carries different size chart. But you can refer to rough guideline as below.
Please refer to our size chart in each product page for sizing details. Our size chart for recent launches are both in Clothing's and Body's measurements. Garments' measurements will be 3-6cm bigger than body measurements, depends on cutting.
If you are unsure what size you should take, please contact us with your body measurements/garments measurements, your weight and height, we will advise accordingly.
Guide on how to measure your body can be found here.