Bare arm skin, too has no back, pressed against someone scantily dressed, unhygienic...
What a lot of crap.
Lots of people wear sleeveless tops on a flight. The fact that the band of middle/back was exposed is neither here nor there. It’s not going to be pressing against anyone else unless they’re encroaching on her seat.
...and anyone that thinks her back touching an airline seat is going to make it unhygienic would never fly again if they knew what you’d find in the fabric of airline seats and should stop travelling on busses and trains.
It adequately covered her boobs, it looked nice with her trousers.
...and frankly, if I had her figure I’d wear that on a plane because I’m always too hot. But I don’t have her figure, so I don’t. I just threaten to strip to it if they can’t sort the air con out - it normally gets sorted sharpish then 🤣