Whistles bodycon dresses

[Walnut8]

Can someone tell me whether these are very tight? There is a stretch silk one that I'm interested in but can't try on before I buy so I'm wondering whether to size up. Thanks

I think they're true to size.
A little bit of stretch but not too much.
I'm a 10-12, with big boobs and I take the 12 to accommodate them although I'd probably take their 10 if I didn't have big boobs.

Thanks Vivi - what do you call big? Mine are DD ...

Mine are a GG - I think you'd get away with your normal size TBH
I really like the style though - its very flattering