hmmm not sure how the European sizes compare to the UK sizes but I usually buy my PLUS size clothing from a couple of specific stores here or then online...
for swimwear specifically I find DEBENHAMS, MATALAN, TKD LINGERIE and MANGO's VIOLETA range, NAMSHI for the best selection...
can you let me know what size you are in UK then I'll be able to send you more specific links
Uk size 24-26 and if you c an let me know where to find the shops?
thanks very much!