IMHO, dress that is dignified and modest is what Jews ought to wear. I think looking “professional” in this day and age is a kiddush HaShem; a groomed beard, suit and tie for men, and a sheitel, skirt suit, etc. for women is clothing that clearly makes us appear dignified in the world.
I wish our tefilla be tzibbur were still dignified. The image of rabbi and chazzan in Geneva gowns, with a well-coordinated choir singing Lewandowski and Sulzer, and a polished, meaningful sermon, are sublime. I’ve only experienced that in a handful of places: Shearith Israel, Breuer’s, and at Princes’ Road in Liverpool. I wish Minhag Anglia had made its way to America.