Bra guru knowledge required please

[justcallmethefixer]

What is the fit like on the panache Zara plunge?
After following measuring advice I have ordered a 30F as I am 30 underneath and 37ish around fullest.
Tia

To be honest it came up quite small so you might need a 30ff.

Well in that case thank goodness for free postage.
Whilst I'm asking, what about the wonder bra ultimate strapless? I think I remember reading that these are small in the back and it's better to go up a band size. If so would I want a 32f, 32e or something else?

I'd try 32F in the strapless. I'm a 30GG and wear 32G.