Pumpkin Patch Maternity Clothing - Sizing?

[ceolas]

I am usually 20 top, 18 bottom.

Would I fit XL do you think?

Is it any good?

I would say XL is more or less equivalent to an 18 (that's with PP here in NZ, I guess it's the same in the UK). I had a few XL tops which I'd say were 18s. not sure on the bottoms though