Because Comexim is a Polish brand, the cup sizing is not going to exactly correspond to traditional UK brands (like Panache, Freya, Elomi, Curvy Kate, etc). The size listed IS UK sizing, but Comexim bras run about two cup sizes small compared to these UK brands. SO, for a fit that is technically correct and gives adequate wire coverage on the sides, you should order two cup sizes larger than you do in your regular UK styles. For a little extra oomph, only order up one cup size, especially if you have an empty/shallow upper bust. This will give you more volume and a little less side coverage. Keep your normal band size.
The Comexim Lilly Padded Plunge Underwire Bra (CMLILLY) blends sultry styling and construction with beautifully feminine design. It features multi-section molded and padded cups for an emphasis on high, rounded shaping, plus a deep plunge front for cleavage and a push-up look and feel. Fully adjustable straps let you customize your lift. Pick up the Comexim Lilly Matching Brief (CMLILLYMB), sold separately, for a matching lingerie look.