Mainstream clothes for sure, but I feel the same way about mainstream women’s clothes. Waist high jeans, an inoffensively colored top and a vest or blazer. Switch out the jeans for beige linen pants in the summer. Yawn. If you want inspiration for some more interesting clothes in general but men in particular, you gotta look to non-mainstream subcultures. Especially ones that don’t give shit about gender. I hung out with hippies for years and men and women alike are dressed in cool, colorful and interesting clothes. Both genders wear pants, dresses, and skirts. It heavily inspired my style and believe me, I stand out a lot among other women. If you want more variety you have got to look further than what’s mainstream. Because that’ll always trend towards boring and basic.