Putting stockings on a sex doll is fine. silk stockings on a prosthetic leg is not, because the situations aren't comparable and don't align with what most people would normally do.
If your prosthetic leg is part of your public image and something you actively present and even benefit from then choosing to cover it with stockings seems contradictory. It doesn't fully hide the prosthetic anyway, and it just adds unnecessary inconvenience.
We usually see prosthetic legs being decorated to stand out, rather than to blend in. right?