Honestly, I think the outfit he had in the Kecmanovic match was half-decent. It's obviously tough to work around that skull logo if the designers are gonna try to make something classic/elegant, but there's ample proof that Hydrogen can do MUCH worse than what he was wearing. Had his right sleeve been the same as the left one, this outfit would have been downright restrained.
I think there's an art to having something gaudy become classic. Some of those early nineties Nike kits (that they leaned on heavily for the US Open kits from two years ago) are objectively garish, but they're somehow also just right.
Anyway, logo aside, the shorts Karatsev was wearing in his match are pretty decent. I'd dig a navy/white stripes version. Or red with navy or white stripes.