Hehe, looks like you don't need any meatfree Mondays tips from me, you're ahead of the game
At my clothes swap party we did shoes and accessories as well, and as you say it's a bit easier among various-sized friends. But don't rule out the clothes altogether, we found that a lot of the stuff people brought along was perfectly lovely stuff that just didn't fit right. People often have things they meant to get taken up, or bought when they were young enough to not mind it being tight/short.
Or you can ask your friends to bring a friend, so you get more variety and also see some things that are new to you. It's a bit like thrifting only you can do it in the comfort of your own home.