help i found dd old clothes hidden in ds room

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While having a sort out i found a carrier bag stuffed in the back of a drawer in ds room my heart sunk when i opened it i actually felt sick it was full of my dd old clothes including underwear but also some items that did not belong to dd.I dont know how to handle this i was going to ask dd if she knew anything but dont feel that would be fair at this stage, i probably should throw them away and hope he grows out of it but i dont want to hurt him or stop him coming to me if he needs to talk it is a great shock and really hard to know what to do.I try to be openminded and try to see things from all angles but to be honest i cant seem to think straight.
I need to talk to him but how do i bring it up and should i let him carry on or tell him he must stop i worry about other people knowing and the reactions he will get.
Anyone else been through this any advice please.

OK i know i said i would leave this but something happened at the weekend which gave me the chance to talk to dd about this, well she says she knew he liked to wear her things but thought "it was just a bit of fun just dressing up". She found ds plying with her make up a couple of years ago and had thought it would be fun to make him up properly, she had then left him in his room for most of the day but said she was surprised when he still had the makeup on at lunch time.Since then he has often asked her to make him up again, and has asked to borrow her clothes.
My concern is would he be happier if he knew i knew, i dont mind him experimenting as i said i think i am pretty open minded but i dont like secrets i dont think they are healthy for anyone. I can understand if he only wants to do this in private that is fine.
At the same time i dont want to be encouraging something that may just be a phase but would like him to know i will support him if this is how he wants to go.So still would like to hear from anyone who has been through this we cant be the only family in this situation can we.

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