normcore

A unisex fashion trend characterized by average-looking, unpretentious clothing.

That means he's normcore. Dangerously regular. Dresses only in T-shirts an' jeans, uses slang appropriated from other sub cultures, but only 3 years after it's^([sic – meaning its]) first use, an' only after it's been used in a sitcom.

Clémence would say that his style was normcore before normcore became a thing. She had to admit that she still found him attractive.

Any style that is mainstream or unremarkable.

"That's normcore painting, and that's what people are buying and trading now," [Deborah] Kass said, along with some slightly more colorful critique she opted to keep off the record.