You can have your wedding reception in a tent. You can have an open bar for your wedding reception. You cannot have both at the same time. There's always going to be one drunk uncle who forgets that shadows are a thing!
"You guys, do you think it would be funny if we pantsed dad when he's walking Betsy down the aisle? Let's just go for it! It's not like it's the happiest day of her life and shouldn't be ruined or anything!"
Don't show up to a wedding wearing the same dress as another woman. Also, don't show up to a wedding wearing the same fabric as the furniture. It's a fashion faux-pas. Also, people might not notice and sit on you.