What ever... Being 6' 4.5" and 74kg (never yet told being fat), wearing between smallest being a size 10 and up to 12, or 32 - 36 pants, tops mostly size 14, sometimes medium, yet fitted jackets 16 and e.g. Carducci not even a 40! (too small) and German size 40 again being to big.
You go take you pick. Panties being small, most medium being to big.
If it makes sense you're welcome. I did loose easily one size on top (shoulders) and been adding close to one size on bottom. Skirts just about still fit size 10, (32) but more comfortable by far in pants 34, 35 and also 36.
Greetings,
Axelle