According to the article below, you can damage your psychic aura if you wear the feathers of dead birds. It says nothing about collecting naturally dropped feathers from living birds, but I guess we shouldn’t get too technical.
The early 1900s saw a lot of strange beliefs concerning the psychics and auras, smattered with the word “scientific”. While I certainly won’t deny the existence of psychic abilities or auras, I will gladly say that people in the early 1900s took things a little too far.
Newspapers were filled with accounts either supporting psychic abilities or debunking them. This just happens to be one of the sillier articles published.
The Wearing Of Dead Birds Endangers Integrity Of The Psychic Aura
London. — The psychic aura in general, or, anyway, that particular brand of psychic aura which encircles the heads of nobility, shows alarming tendencies to decomposition when decorated with the feathers of dead birds. Such is the scientific discovery announced by the Countess of Warwick.
The psychic aura, or soul halo, she maintains, has certain reactions upon the inner soul, and hence when exposed to the degenerate influences of dead-bird decoration produces disastrous effects upon the psychic phenomena of the wearer. However, feathers of the ostrich are exceptions to the rule.
Source: The Day Book. Newspaper. February 26, 1914.