Well if it's any consolation it is less like arms and more like wearing a bunch of bones because it is part of the exoskeleton. There's lots of bone jewelry out there, some more primitive some fantastically carved. Animal insides, outsides, leather, fur, hair and bone, it's really all the same to me. The only animal fibre the animal doesn't die for is hair/wool so in essence you are wearing part of a dead thing anyway with the rest. I can see how wearing dead things would be unsettling for some but I guess I don't understand how wearing the skin of a slaughtered dead thing or the pupa casing of a boiled alive juvenile dead thing are less macabre than wearing the bones of a died of old age dead thing. I think it's a case of just being more comfortable with things that are familiar.
I wouldn't wear it because really, how'd you wash it?? Though it is an over dress so shouldn't get body dirt, I am really good at getting food/ingredients/misc all over myself.
I think that in the context of the play Macbeth that it makes a lot of sense. Lady Mcbeth says to take away everything that makes her woman, all of her softness, to steel her for the task. She builds up her shell and has to be the strength for Macbeth who isn't so sure at first that regicide is what he wants to do though he wants the crown. Then when the deed is done Lady Macbeth fractures inside her shell and she is shaken to the core. I feel like the beauty of the dress is one thing and that in the shimmering of candle light of the old stage would be awe-inspiring, but the beetle wings represent her character all the better, green for envy, hard but brittle, and like a beetle totally undone by the breaking of her shell. It is an extremely well thought out piece of costume design.