From the author's README on Thunderstore

Supreme_Number_Nine_Mickey_Mouse_Varsity_Jacket

Made By Lunxch and Brazy

Includes

Two Supreme/Number (N)ine/Mickey Mouse Varsity Jacket in the official color ways

Installation

Download from thunder store or extract and drag zip into skate folder

Install Supreme Number Nine Mickey Mouse Varsity Jacket FW25

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

Open ReSkateLauncher.exe and go to MODS.
Search for Supreme Number Nine Mickey Mouse Varsity Jacket FW25 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.