I worked in the US and agree with every thing super mum has said, and I'm amazed that people are having a go at her about her experience of working in NYC.
The OP is asking for advice about what to wear and how groomed she has to be not to stick out like a sore thumb when she's working in corporate environment in the US and she's been advised to wear boring conservative clothes, and to up her grooming. All these things I'd agree with.
Also, some posters who are actually in the US, working in a corporate environment have suggested that she up her jewellery and accessories and somehow this has got everyone up in arms.
Life isn't the same the world over, and thankfully it's not all like what it's like in the UK, where in my opinion shabby is somehow equated with worthy and clever.
I've worked all over, west and east, and I have to say an investment watch and real pearls / diamonds have always gone down well.
We are monkeys who wear shoes. Of course we look and judge, and if that means we are discriminatory and superficial in a work environment, well so be it, as time is short. Suit up and show up, and for women remove body hair, groom brows, upper lip and sideburns, and have a regular neat manicure.
OP if you want to play up your european perspective, wear a Hermes scarf, and drink tea.