^^^i dont know too much on the issue, but uchi IS a feminine pronoun, despite it not being "gendered". People can use guys and dudes to refer to both genders but people will still associate it with males.
atleast thats what ive picked up from accidentally witnessing like 100 splatoon arguments on twitter lmao
Uh, 'uchi' is a personal pronoun. You use it to refer to yourself. It's more feminine than masculine, but I've definitely come across male characters using it
^Who wears pants in bed? (I know some people do, but I certainly don't haha)
Also to answer the question more seriously, I'm pretty sure her design here is based off her official dakimakura art, in which she's rocking the "naked-shirt" look. Here