It threw me off at first, too, but I think maybe they’re undressing. In the first panel, it looks like they have a patterned sweater vest on over their pink long sleeved shirt. Then in the second panel, it looks like that’s off and they’re starting to undo the pink long sleeved shirt that was underneath. In the last panel, the pink shirt is fully open, like they were just about to take it off before they were told there will be no sharing the bed.