The New Kind of Flesh: "Get out your animal suit"

So everything has already been prepared for the birth of tragedy, and after all that you're supposed to get out your animal suit?  Maybe having your animal suit ready was part of the preparations for the birth of tragedy, and getting it out now is part of the process of actually giving tragedy its birth: you put your animal suit on over your human flesh, and tragic things happen.  That's certainly been my experience more generally.

On the other hand, putting on your animal suit might just be another directive to you the reader, or to the doctor, on the list of things to do leading into whatever comes in the following stanzas.  It could be that the birth of tragedy is only one incidental event in a series: i.e., the connections between lines may be paratactical rather than sequential (most likely both, though).