Because the color and design looks pretty normal for daily outfits but now it's different with cloak and military patch. That's a real look for cosplay.
I actually love military cosplay from anime. Something like this
Shinsengumi
I guess I can wear this shinsengumi jacket and drive my motorbike
Because if you're wearing yukata in public without unsual hair color and style, people just assume there's natsu matsuri nearby.