Jan,
I love this! Every word holds its weight. The repetend reinforces the impression of time's inevitable appointment ahead. The speaker aptly uses the raincoat as a stand-in for his self.
The raincoat holds the shape of me
so can’t it go instead?
It holds the emptiness you see
that’s in my hands and head.
Drizabone is a juicy word; it sounds like dry as a bone. I don't mind one exotic word in the poem (at least it is to me), especially when the rest of the diction is rather simple, in a good way. These are just my initial thoughts.
Best,
Erik