Carhartt is my default.
It should not be news to you, but if Carhartt is your default, you are way ahead of the game.
Pushing your wardrobe boundaries is an effective, easy way to start to push all sorts of boundaries.
Start with Carhartt itself, which figured out it could be fashionable back in 1989, 100 years after the company itself was founded, and started Carhartt W.I.P., the design-forward arm of the business.
Wear your usual Carhartt workshirt on top, but let a pop of turquoise, emerald, yellow, red or pink show through.