I'm back again, because I got the Lost Boy's book by Paul Davis. It has some really amazing anecdotes about the making of the film, but also parts that I think would be a helpful contribution to this thread (I hope! I went through all the other posts to make sure I wasn't mentioning things already said... but I may be... if so, deepest apologies!)
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From this page in particular: David's buttons are all watch-faces!
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Billy's jacket was distressed in a similar way that I distressed some of my clothes for Wasteland Weekend: drive them behind a car! In this case, a motorcycle...
Laddie's jacket was bell-hop in style in reference to the hotel falling into the crack, which is so splendid. And Michael's sunglasses were from LA Eyeworks:
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Anyway, some neat anecdotes from this book! They cover a whole lot of the "making-of" but this is the primary part dealing with the costuming/jackets