From the author's README on Thunderstore

Custom shirt package for Rush Skate.

Installation

Install this package using the compatible Thunderstore mod manager for the game/community that supports this mod.

Notes

Package version: 1.0.0
If the shirt does not appear in-game, verify that the package is installed in the correct game profile and that the required mod loader is configured.

Credits

Created by the package uploader.

Install Truand 2 La Galere Custom Shirt

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

Open ReSkateLauncher.exe and go to MODS.
Search for Truand 2 La Galere Custom Shirt 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.