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.
The Comexim Butterflies Padded Plunge Underwire Bra (CMBUTTERP) has a lovely, feminine floral and butterfly print in subtle tones and a high, defined fit and feel. This underwire bra has a deep plunge neckline, plus plenty of lift for a very defined look. It features adjustable shoulder straps, a flirty bow detail at center front, and a low scoop back. Pairs perfectly with the Comexim Butterflies Matching Shorty (CMBUTTERMS), sold separately.