There are some wide variations in what was worn at what time. I personally have about 1200 photos of the 10th in combat and access to another 8000+ through the Resource Center. If combat in Italy is the image you are looking for, both the M-43 and the Mountain Field Jacket are worn, and many of the photos show Aid Station soldiers in shirt sleeves - it was a warm Spring. There is about equal split between wool Combat trousers, Mountain trousers and M-43 trousers. Boots go heavily to the 2-buckle variety, with a few (very few) wearing Mountain boots. I have one photo that comes to mind of 2 soldiers in an aid station wearing wools, M-1938 leggings and Parsons jackets (they could be ambulance drivers or soldiers from other units - cannot tell for sure)
Equipment was generally the std Medic bags with yoke and pistol belt with 2 canteens. Almost no rucksacks are seen, but both the Yukon and plywood packboards are common. The BAS teams usually transported their chests in the packboard pack, not in the usual chest. RAS teams used the chests according to the men I've talked to.
Markings - the field medics usually had traditional helmet markings and a single brassard. Soldiers and officers from the 10th Med Bn (Aid Atation complement) used a peculular 3-panel marking on their helmets - at the insistance of the Med Bn commander. Rank markings were applied in white paint on the front of the helmet, and the serial number was stenciled across the top from front to back - on the liner, too. I have photos if you want to paint up one. (real ones sell for huge dollars!)
Head gear - everybody had a helmet, and a few of the guys wore Mountain caps, but the preferred head gear was the Jeep cap under the helmet.
What else would you like to know?
David J. Little
President, Tenth Mountain Division Living History Display Group
Secretary, Tenth Mountain Division Foundation
Board Member, Tenth Mountain Resource Center
Past Webmaster, National Association of the Tenth Mountain Division