It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) forbade two types of sales and two types of clothing. The two types of sales are mulamasah and munabadhah, and the types of clothing are ishtimal as-samma' and al-ihtiba', that is, sitting in such a manner in a single garment that nothing covers the private parts. He forbade this.
Hadith Referenceالسنن المأثورة / باب في البيوع / 231
Hadith Takhrijصحیح بخاری، الاستئذان، باب الجلوس كيف ما تيسر، رقم: 6284، صحیح مسلم، البیوع، باب ابطال بيع الملامسة والمنابذة، رقم: 1512