Mod for PvP/RP server?

I was wondering about the possibility of a hopefully simple mod. I was wanting an item skin that would create the alpha buff appearance for humans to wear to take part in an event. It would just be something to easily see who they are and pick them out. It doesn’t need any sort of stats. Just the appearance for them to wear. It would be neat if it could be a couple different colors, but that’s not a must. I’ve tried to figure it out myself, but I’m not dev kit program savvy at all.

If anyone is interested in doing this just send me a message with a pricing, if required. Thank you!