None of the personal cosmetic items will give you an advantage in-game.
They are just for show.  All donations are final and are used to achieve goals within the server. None of the donations are used for personal gain.

All custom items MUST be added to the general drop table and trader stores as per requirement by the BI EULA and Monetization guidelines.

From June 1st 2015, anyone who registers, is approved, and is listed on https://www.bohemia.net/monetization/approved/dayz is allowed following monetization of their Dayz „private shard“ servers:

Charging players to access your server, if the fees and associated perks do not affect gameplay in any way, is allowed.

Limiting access to only paying players is allowed. Product placement, in-game advertising and sponsorship is allowed. Accepting donations is allowed, but to avoid any doubts: not providing donations must not prevent anyone from accessing the content.

Selling of in-game items, that don’t affect gameplay, and selling of cosmetic perks are allowed. (Applicable only to servers with mods, after modding support has been added to Dayz)

Please remember, that these rules do not apply to public hive Dayz servers or the Dayz mod!

If we feel anyone on the list at https://www.bohemia.net/monetization/approved/dayz is exploiting any loopholes or is not acting in the best interests of the community, we will remove them. That will mean they will have to cease this kind of monetization immediately or face legal action.