[quote=ImportantNobody]
It would be hard to not notice that, unless it's was an inside chest pocket and she slips out onto her boobs at some point after she's already wearing the outfit for a while. After being noticed, from that point on she could purposely sleep there.
[/quote]

Well, it hasn't been mentioned yet, but Hanami has a small pouch full with vials of like... tonics and stuff. She could go there.