Since you are asking for hunters living in a tundra, you can look back at Ötzi (not middle age, though)
Ötzi's clothes were sophisticated. He wore a cloak made of woven grass and a coat, a belt, a pair of leggings, a loincloth and shoes, all made of leather of different skins. He also wore a bearskin cap with a leather chin strap. The shoes were waterproof and wide, seemingly designed for walking across the snow; they were constructed using bearskin for the soles, deer hide for the top panels, and a netting made of tree bark. Soft grass went around the foot and in the shoe and functioned like modern socks. The coat, belt, leggings and loincloth were constructed of vertical strips of leather sewn together with sinew. His belt had a pouch sewn to it that contained a cache of useful items: a scraper, drill, flint flake, bone awl and a dried fungus.
The leather loincloth and hide coat were made from sheepskin. Genetic analysis showed that the sheep species was nearer to modern domestic European sheep than to wild sheep; the items were made from the skins of at least four animals. Part of the coat was made from domesticated goat belonging to a mitochondrial haplogroup (a common female ancestor) that inhabits central Europe today.
The coat was made from several animals from two different species and was stitched together with hides available at the time.
The leggings were made from domesticated goat leather. A similar set of 6,500-year-old leggings discovered in Switzerland were made from goat leather which may indicate the goat leather was specifically chosen.
Shoelaces were made from the European genetic population of cattle. The quiver was made from wild roe deer, the fur hat was made from a genetic lineage of brown bear which lives in the region today. Writing in the journal Scientific Reports, researchers from Ireland and Italy reported their analysis of mitochondrial DNA, that was extracted from nine fragments from six of his garments, including his loin cloth and fur cap
His body was also found to have tattooes in places where he had physical problems, so they had some kind of magic belief.
Since his population lived in the Alps there are some similarities with the tundra.