Advice on who pays for what for bridesmaids...?

You know your friend's situations financially more or less. They've paid $200 (plus alterations, I'd assume) for a dress, plus what it will cost for this weekend getaway-there's another few hundred bucks at least. Being in weddings is costly, and you need to just keep in mind, that these women are ONLY doing this as a favor to you. None of this is for them. Be careful with how you spend their money.