mimi maternity has very nice stuff, you should be able to find something dressy enough. pea in the pod has reeealy nice stuff, expensive though, i got my maid of honor dress there, gorgeous. destination maternity has stuff from both places, lots of it discounted, you should definitely check there first. they are on rt 110 in huntington, they have a website too, though im not sure if you can buy online. you can go there, and if you dont find anything, head north to northern blvd where pea in the pod is. there is a discounted place in the fortunoffs mall also, but i dont know how dressy they get. mimi was in roosevelt field mall, i think its still there, but i would check online first. also, fyi, the macys in walt whitman mall, across the street from destination maternity, has a motherhood maternity in it. motherhood is a lot more casual, as im sure you know, but if you do find something, the nice thing is that they accept returns, whereas most motherhoods dont. but again, call first to be sure, its been a while for me... have fun at the parties :)