Discreet prosthetic arm: A Steampunk nonsense?
There are lots of steampunk prosthetic-mechanical arms and hands, but I can't avoid think about "less are more".
I mean, a mechanical arm in brass, cooper and leather talks about your wit and ability, but a (simple) wired frame UNDER the jacket, apparent only by bumps and tensions under the sleeve and glove, and even better with mechanical wishpers and quiet pneumatic sounds when it moves (if you are so gifted), tells a story about the character of your character (if you understand me): for example, an inventor who has lost the use of an arm, may try to recover it and keep it hidden, like a shame. You can link it with an accident, a tragedy, a heroic act or a sacrifice. It would be part of my character, If I would had one.
BUT steampunk is all about aesthetic, so... is it a nonsense? Or is it a second-level, deeper dive in the steampunk world?