Weddingbee boards

Any ladies out there have suggestions on a long-line strapless slip?

My dress (Jessica McClintock "Isabella") has a sweetheart neckline. I won't be wearing a crinoline since it adds WAY too much poof, and a separate bra/slip will show underneath. 

I'm not packing much of a punch in the chestal region, so I'll need something that has lots of staying-up power! I've looked at Spanx, but those aren't really what I'm going for. I'm already pretty thin, so I don't need something that's going to strap me in like a straight-jacket...just something that will create a smooth shilouhette and will stay up on me.

Any ideas would be greatly appreciated! :)

Thanks! 

I know you said you didn't need Spanx but their strapless slip does just that...makes a smooth shilouhette....I bought one and love it.

**litsecretary - is it the kind that has leg-holes? or is it an actual slip?

 i'm not down with the bike-shorts look on my wedding day! :p