I looked online to see if there were any patterns already, but I didn't see one that was simple, had a way to distinguish whose was who's arrows. So I came up with a pattern myself!
I think it turned out fantastic, and with the awesome little accent piece that each child picked out, they know which one is theirs!
The pattern does get a little tricky when you have to layer the straps to attach them at the top, but I made a nifty little diagram that will hopefully help you.
Happy sewing!