From the author's README on Thunderstore

Rocky's Clothes

Three new cosmetics for skate.

Item Slot Brown Double-Layer Tee Tops Flame Graphic Tee Tops Dark Blue Baggy Jeans Bottoms In game

Open the clothing menu. The tees are under Tops and the jeans are under Bottoms.

If an item doesn't show up, check the mod isn't marked OUTDATED in the launcher, then try disabling other cosmetic mods.

Credits

Made by Rocky. Built with ReSkate Studio.

Install Rockys Clothes

You need ReSkate and your own copy of skate. on Steam.

Open ReSkateLauncher.exe and go to MODS.
Search for Rockys Clothes and click install. The launcher also installs anything it depends on.
Press PLAY. In game, the MODS tab of the ReSkate menu (Insert) turns it on and off.

Or install it by hand: download the .zip and drop it on the launcher window, or unzip it into its own folder in Mods\ beside Skate.exe.

Maps show up in the ReSkate menu's level list. To join a server running a custom map, you need the same map installed. If the game won't load after installing, see known issues.

skatemods doesn't host or review this mod. The download comes straight from Thunderstore. Only install mods you trust, because scripts can run code.