Ray J's being sued by an L.A. stylist named Marc Littlejohn, who claims he gave Ray J $2,880 in designer threads for a Grammy event ... and they were never returned. According to the lawsuit, they were left in the Beverly Hilton hotel room where Whitney died and haven't been seen since.

But now Ray J's rep tells TMZ the mystery was solved last night when one of Whitney's associates handed the clothes over to the singer. Sources tell us the items were taken from Whitney's room along with the rest of her belongings. We're told Whit's people couldn't get in touch with Ray J because he changed his phone number.