My cat would murder me if I dressed her up. She's normally sweet and docile, and she never bites or scratches us. But she always gets extremely upset when we try to dress her. My sister used to wrap little scarves around her neck and such. She would try to hard to get them off, practically choking herself in the process! When she realized that it wouldn't come off, she hid behind the couch and refused to move. When we tried to get her out, she just glared at us, probably blaming us for putting her through the humiliation xD My sister also tried putting little hats and stuff on her, but it had the same effect. So, I don't think I'd ever be able to dress her up. I don't really want to, though. For me, that was more of a childhood thing, wanting to dress up my kitty
Your cats look adorable though! And if they don't mind it, I don't see anything wrong with it. For some pets, it's torture. But some don't seem to mind it, and I think it's cute on a pet who isn't constantly trying to get it off and/or glaring daggers at you, haha!