From the author's README on Thunderstore

Black and teal feathered wings worn on your back in skate. They ride on the upper back and move with your torso.

Where to find it

Open your wardrobe and look in Eyewear (Own_Hardcore_Wings). It uses the eyewear slot so you can wear it with any backpack; it replaces glasses while worn.

Install

Install with a mod manager, or copy this folder into your ReSkate Mods folder, then turn it on in the ReSkate launcher.

Notes

Fan-made.
Ported from a GTA V / FiveM model.

Install Hardcore Wings

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

Open ReSkateLauncher.exe and go to MODS.
Search for Hardcore Wings 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.