So, looking at the beastmaster outfit, I've realized its completely outclassed by clothing you can buy with arena tickets (Though, I'll admit Arena Tickets are borderline impossible to get enough of nowadays unless youre a high level PvP player that moonlights as a meta sheep).
Regardless of that, my idea for a minor buff for it is just increased energy regeneration. I'll say, -30 seconds to the wait time for each piece, with the shirt providing an additional 30 seconds, giving a total of 2 minutes faster per energy. This doesnt feel incredibly game breaking, given wearing it youre basically sacrificing combat viability in the late stages, and it means energy elixers are still a far better way of regaining energy if you need it now.