"The Messenger of Allah forbade Munabadhah and Mulamash. Mulamasah is when two men trade garments with each other under cover of night, each man touching the garment of the other with his hand> and Munabadhah is when one man throws a garment to another and the other throws a garment to him, and they trade them with each other in that manner."
Reference: Sunan an-Nasa'i 4513 In-book : Book 44, Hadith 65 English translation : Vol. 5, Book 44, Hadith 4517
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