P.s. I do not find anything "flight attendant" about the navy suit. It is an impeccable suit and fits impeccably. I also don't see anything wrong with having such a suit in your closet, assuming it's not breaking your budget.
The trick is to style it so it doesn't scream "I used to be in banking." If I was to wear it to an interview, for anything other than banking or fashion, I'd style it up with shoes packed with personality (anything other than a black pump), a fantastic bag, statement necklace or scarf, etc. The devil is in the details. A suit like this can go from banking/conservative to, say, high tech with a switch of accessories.
To make it work for a fashion-related job, it would need to be broken up into separates and mixed with other pieces. Like, I dunno... wear that suit jacket over a black leather skirt, or a lace skirt, or over a neon dress, or with slouchy trousers.... or take Angie's tactic for her Stacy London interview, pair an impeccable suit with an impeccable white collared shirt and an amazing pair of fashion-forward shoes.