Just a clarification: I should have been clearer that I was talking about the fact that the crewmembers’ Starliner spacesuits would not be compatible with Dragon, so SpaceX would have to do their best to send up SpaceX suits that would approximate their body dimensions as closely as possible. I also wonder how quickly that could be done since spacesuits are essentially handmade, and I doubt SpaceX keeps spares just lying around. I wonder how long it would take to produce them?
They can technically re-enter without suits, but it’s a violation of safety procedures. OTOH, presumably NASA or Boeing has their suit measurements somewhere, and the SpaceX folks could use those to make SpaceX compatible suits. And then they should fire the idiot who thought it was okay for Boeing and SpaceX to have incompatible suits.