Musannaf Ibn Abi Shaybah

Ibrahim was asked about loosening the lower garment during prayer, so he said that he should neither open it nor spread it, rather he should wrap it and lift it up.

Hazrat Mujahid says that when you are in prayer and you have an izar and a sheet, and you wish to tie the izar, then loosen your sheet and tie the izar. Ibrahim bin Maisarah says that I mentioned this to Hazrat Tawus, so he said that this is better.

Ibrahim has considered any action during prayer, even buttoning the shirt, to be disliked. Ibrahim did not see any harm in lifting the lower garment during prayer to loosen it.

Hazrat Jareer Dubi narrates that when Hazrat Ali (may Allah be pleased with him) would stand in prayer, he would place his right hand on his wrist and remain in this position until bowing (ruku). However, he would lift his hand to adjust his clothing or to scratch.