Most Helpful Guy
I assume strapless bras are sturdier around the band, in order to hold the ta-tas from the bottom rather than supporting them from a girl's shoulders. I could be wrong, but I don't think it takes too much effort to imagine how they work based on how they look ;P
Most Helpful Girl
The one I have from VS hooks in the front. The band's supposed to hold them, but it's never worked properly for me. You have to continually pull the bra up. I just do without a bra if it's a strapless dress, or find a dress that has some in-built support.