If you don't know the answer, please don't respond. When people see in 'New Posts' that someone has submitted a message, they come in hoping to find an answer, not a guess.I do not know what diagramming means, but, I, as an incompetent twit, wish to make a tentative attempt at determining the function of "accustomed to". Why attempting? I like to see my nonsense in print. It is one of my caracter faults, please forgive me.
"Accustomed to" is not a syntactic unit of any sort, only a fragment of the adjective phrase "accustomed to being bare", in which the adjective "accustomed" is head and the PP "to being bare" is its complement. It isn't elliptical, though: no words are actually missing from the sentence. Relative clauses aren't the only expressions that can function as post-head modifier. We also find AdjPs (as in your sentence), PPs ("a hut in the forest"), NPs ("our friend the mayor", and non-finite clauses ("the person for you to consult", "students living on campus", "a letter written by his uncle").How to diagram "accustomed to"?? As in: His jacket showed red wrists accustomed to being bare.