Sahih Bukhari Volume 008, Book 074, Hadith Number 300.

Narated By Abu Sa'id Al-Khudri : The Prophet forbade two kinds of dresses and two kinds of bargains; Ishtimal As-Samma and Al-Ihtiba in one garment with no part of it covering one's private parts. (The two kinds of bargains were:) Al-Mulamasa and Al-Munabadha.