Sunan Abi Dawud Book 2, Hadith 338
I witnessed the Prophet (ﷺ) raise his hands in front of his ears when he began to pray. I then came back and saw them (the people) raising their hands up to their chest when they began to pray. They wore long caps and blankets.
“He then placed his right hand on the back of his left palm and his wrist and forearm.” This also adds: “I then came back afterwards in a season when it was severe cold. I saw the people putting on heavy clothes moving their hands under the clothes (i.e. raised their hands before and after bowing).”
I came to the Prophet(ﷺ) during winter; I saw his companions raise their hands in their clothes in prayer.