What is Isabella Oliver Maternity sizing like?

[NinkyNonker]

Does it come up big/small/long/short etc?

I am a small 14 pre-preg and wondering if I could get away with a 3 (approx a 12 I think)...

I found it very generous. I was (sob! No longer) a large 14 and the 4 was big on me. I could've definitely has the 3. If I was you I'd try the 2 and 3