His influence in fashion was so much that still now, from time to time, designers build collections with base on Bowie's eccentricity, fashion magazines do special editorials dedicated to him, or celebrities point him as their fashion inspiration and icon (Our "Gaga" is one of them!).
It is totally understandable that people get inspired by David Bowie. He never goes out of fashion: it always sounds cool for a celebrity to mention Bowie as an influence. He is one of the biggest fashion icons ever and will always be a reference of unique and groundbreaking style to all kinds of medias.
Even though a lot of entertainers try to be cool and original as David Bowie, that's something most of them do not concretize. Everything Bowie created seem so natural to him; it looks like "coolness" is his natural gift.
Anyway, as we can see, the Bowie trend last forever. ;)