You could always just get a small duffle bag to put just the cape in so it isn't consuming your entire suitcase. Or you could have a suitcase dedicated entirely to cosplays with a smaller suitcase or bag or something dedicated to your normal clothes. I usually have a separate bag for my bathroom stuff (make-up, hair brush, etc...) as well to keep everything organized.
-Mako (Kill la Kill)
-Popstar Ahri (League of Legends)
-Jill Valentine (Resident Evil 5)
-Poison (Final Fight)
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