I absolutely believe that cats understand more than what they let on.
My parents have two cats, Odin and Honey. Odin is a senior cat now but he’s always been sweet as pie. His default position when someone shows up to the home is that they have come for him and must pay tribute to his belly. Honey is pretty typical, if she smells something funny in the air she’s gone before the dust settles.
So one day I come over to my parent’s house to mind the place while they are away and after successfully tithing Odin’s belly I start to look for a place to set my belongings. Off-hand I remark to the cat that I haven’t seen Honey in a while and he should go get her. Odin leaves and I don’t think much of it, kitty shenanigans or whatever they do. I finish putting away my things and I see Honey trotting down the hall, then I hear her yelp because Odin is hot on her heels nipping at her legs.
You believe what you want to about but I know what I do.
If you are able to go with someone else there is safety in numbers. Not just from the general public but from your own mind. Buying a swimsuit can easily overwhelm your sense of self worth so having someone who is championing for you is invaluable.
As for style, whatever you feel cute in. Nothing looks better than confidence in what you’re wearing.