"Wearing the samma' means that a man puts his garment over his left shoulder and keeps his right side uncovered. Munabadhah means that a man says (to another): If I throw this garment to you, the sale will be certain. Mulamasah means that a man touches it (another's garment) with his hand and neither he unfolds it nor turns it over. When he touched it, the sale becomes binding. (Using translation from Abū Dāʾūd 3378)
عَنِ النَّبِيِّ ﷺ بِهَذَا الْحَدِيثِ زَادَ فَاشْتِمَالُ الصَّمَّاءِ يَشْتَمِلُ فِي ثَوْبٍ وَاحِدٍ يَضَعُ طَرَفَيِ الثَّوْبِ عَلَى عَاتِقِهِ الْأَيْسَرِ وَيُبْرِزُ شِقَّهُ الْأَيْمَنَ قَالَ وَالْمُنَابَذَةُ أَنْ يَقُولَ إِذَا نَبَذْتُ هَذَا الثَّوْبَ فَقَدْ وَجَبَ الْبَيْعُ وَالْمُلَامَسَةُ أَنْ يَمَسَّهُ بِيَدِهِ وَلَا يَنْشُرَهُ وَلَا يُقَلِّبَهُ إِذَا مَسَّهُ وَجَبَ الْبَيْعُ