From the author's README on Thunderstore

BRC Cosmetics 1.0.0

Brings you an assortment of BRC items

All decks, wheels and grips from the base game
Custom decks and grips
Red and DotExe Cyberheads (hats)
Red's Boostpack (in outfits, compatible with clothing)
Faux/Red t-shirt (not 1:1)
Stickers (in-game graffiti + misc)

The boostpack's straps aren't the best, will retopologize/rig better soon

If people ask i'll see about adding more in game models, ask in the thread in the ReSkate Discord server

Install BRC Cosmetics Pack

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

Open ReSkateLauncher.exe and go to MODS.
Search for BRC Cosmetics Pack 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.