VVVVV posh wedding - men in mourning suits - what on earth can I wear??

[SilverLining]

Thats about it! Just found out we've got childcare which was the easy bit as no idea what to wear! Its easy for DH but not sure how posh women have to wear. I'm not really a suit person so thought of maybe an A line skirt and fitted cardi on top with killer heels but not sure if thats posh enough??? Its early April so might be hot or might be cold ....
Someone help - I've just got used to being a SAHM after DD2 and know that I've got to make more effort than I currently do for the school run!
Thanks in advance - SLx
PS DH given me carte blanche with the credit card......

thanks - love the idea of strapless but I really am too well endowed to get away with that - it would put people off the meal!!! Had a look on Monsoon already and there are some lovely things there - I'm just useless at assembling an outfit!

I got a very posh outfit for a wedding by going into the posh part of Debenhams and being waited on hand and foot by the assistants there. It is definitely not my thing to be the centre of attention in that way, but they got me fitted out in a dress, and matching jacket, hat and strappy sandals - all things I would not normally wear. I just about stopped short at the handbag. It wasa bit of a waste of m=oney in a way as I have only worn the dres and sandals once since, but it saved me having to go round trying to match things up.

If the men are in morning suits, I don't think a cardy would be smart enough.