This is actually the 1907 pattern "Cap,
Winter, OD." It is the original version of the cap and the predecessor
to the cap shown in an earlier commentary.
The seller acquired this cap from people who "had a uncle who served
Infantry in Italy." He is correct that this is a nice example
of a very early U.S. Army winter
during twenty years of researching the clothing and equipment of the
10th Mountain Division I have found no evidence that they were ever
issued winter caps in Italy. The uncle cited as the source most likely
picked the cap up at a surplus store sometime after the war.
As the photo on the rights shows, some members of the 10th Mountain
Division did wear the
months in Italy. The photo, taken February 6, 1945, shows two members
of the 10th Reconnaissance Troop preparing for a patrol. The soldier
on the left is also wearing the later pattern ski goggles.