I did a bit of window shopping today and in a shop I looked at a few dresses and I saw this pattern and instantly fell in love with it. But in the shop, they only had the first two styles and I think I might prefer the the others.
I love the first style and the last one, not so keen on the second one. If you manage to try them on think it'll make the decision easier because they look like the sort of dresses that I would love on the hanger then hate as soon as I put them on!
I prefer the shape and style of the 4th one (not keen on colour or pattern though!). Will the same people be going to both receptions? If not, one dress will do for both. Worth trying them on though, I have several 'internet' dresses in 'my' size which haven't fitted (too small) but I never sent them back. Lucky you to have big boobs, I'm very jealous. I have to wear padded bras or I look like a boy!
The first one looks like it has an elasticated waist aswell which would nip you in.. you could also wear a belt with it. I think the print is gorgeous and very on trend... not at all old dearish haha :)
i'm guessing that you are not just young but also quite slim and i'd go for the lst one (off the shoulder) abnd if it gets chilly use a pashmina or something similar. don't wear anything tight - you always have to be on your best behaviour eating and drinking and moving. just enjoy yourself.