Dwindle

I have some fantasy armor, a breastplate and a helm, that need some adjustments. The BP is latgo leather and quite stiff. I'd like part of it folded down to better accommodate my body shape. The helm is somewhat large on my head and I would love suggestions on how to make it fit better. In addition, it may need to be reconditioned. Happy to travel outside of Boston to NH, CT, or RI.