Can’t get dressed on site. Arriving fully dressed?

So we have a family’s farm barn for our wedding venue. It’s not over the top and doesn’t really have a place for anyone to change or put on clothes on site. Should I just get dressed at home and then arrive fully dressed already?? Our venue is about 30 minutes away (13 miles) so it’s not really far. Someone suggested getting a hotel near buto get ready in. Is that necessary??? I think that’s a waste of money for us, but I know my FH would have no problem making it happen if need be. Secondary concern, because there aren’t really any other room available, I don’t know where I’m going to hid until my big entrance. We’re going back to see our venue soon and try to figure out a game plan, but wanted to see if anyone had suggestions.