On the garments of the kohen - and how he can bandage a finger with a reed, for example, while he is serving in the Temple, but not if he weren't part of the worship at that time. Plus, a full bandage being a concern of being another garment, and being a problem of adding to the required garments. Size being relevant as well. Also, the kohen gadol who purifies for the service of Yom Kippur, including washing his hands and feet, and also considering the clothing changes - missing an immersion doesn't necessarily invalidate his service. With clear details of how the kohen must position himself - which is interesting, given that it's not quite intuitive.