Is the command not /egiglamour? Unless it's changed very recently, I've been using /egiglamour for ages to change the appearances myself.
Edit: Well, the lodestone article does list /petglamour as an alias, so I dunno. Try /egiglamour and/or /egiglam instead and see what happens. Beyond that I have no idea.
Good luck tho.
https://na.finalfantasyxiv.com/lodes...d/8230653789c/