Add monster list of equpped items
IMHO PC should see what items monster have equipped (because, why not ? *)
Now you can only know what items you companion equipped by analysing message log and get back equipped items only by killing him.
Monster inventory screen should be similar to PC 'i'nventory screen with exception that you cannot see status of items and you cannot take off monster items if he is not your companion)
I think it should be available through executing 'l'ook command next to monster then executing 'e'xamine inventory command
Whaddya think ?
* - PC can aleady see item name, stats and weight when standing next to it, so why should it be not visible when monster will take it and equipp ?