Hair pins based on a find from Finsbury Circus that has been dated to the century. It has probably been used to fasten hair or a headdress. It is described in Egan and Pritchard’s Dress Accessories (one of the Museum of London books) Medieval
Have seriously considered taking a barrel along to camp purely to do this. (I think I would fit in a standard barrel. I'm sure I've seen manuscripts of people bathing basically in a modern wine-sized / shaped barrel.