Not entirely clear the question.
If on some server, then you need to type a command in chat (e.g., !ws)
If you need it on your server, you need to find or create a plugin for this.
CS:GO itself does not support skins through inventory.

On EPOCHE 00s you can. All skins are free with us! just !ws write in chat and enjoy
https://gamemonitoring.ru/counter-strike-global-offensive/servers?name=%D1%8D%D0%BF%D0%BE%D1%85%D0%B0%2000