From the author's README on Thunderstore

Navy Scooby-Doo and Shaggy pajama-style sweatpants for skate., refitted to the skater's legs and rigged to bend with hips and knees.

Where to find it

Open your wardrobe and look in Bottoms (Own_ScoobyDoo_Sweatpants).

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. Not affiliated with or endorsed by Warner Bros.; names and characters belong to their owners.
Ported from a GTA V / FiveM model.

Install ScoobyDoo Sweatpants

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

Open ReSkateLauncher.exe and go to MODS.
Search for ScoobyDoo Sweatpants 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.