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There are a bunch of guides for how one dresses in hanfu or hanbok or a kimono, or just about any other cultural clothes that inspired atla. I don't really see much for the Inupiat, so I'll give it my best shot here:
(Obligatory disclaimer: this is not comprehensive, i just slapped this together while procrastinating getting myself food)
As a base layer, women wore shorts, not unlike the kind worn to protect the modesty of cheerleaders and figure skaters. Men would wear a loincloth style garment, or may forgo it.
Leggings were pretty typically worn. We may think of a pair of leggings as footless tights worn as a single garment that covers the hips. These skin leggings were different, closer to what we may think of as leg warmers. These leggings covered all the way down to the ankles and would tie around the thigh to keep them in place. If this full coverage proved too warm, they could be rolled down and tied at the knee instead. Sometimes mukluks and leggings were not seperate garments, and instead you had well insulated boots tied at the thigh or together at the waist.
Pants could be knee-length or full-length and sometimes were made with boots attached. This pants-boots combo was popular enough that the Inupiaq word for barefoot also means naked below the waist. Pants were usually considered more for men as more of their duties to the family involved needing to stay warm outside, but one must remember that just because it's common doesn't make it always the case. Women could have warm pants for being outside in the winter as well as men.
Mukluks, or kamiks, were traditional boots. Like everything else, they were made of skin. In the Kobuk region, low-cut mukluks were for traveling by land so as to not waste material. They would be worn with fur socks for extra warmth. Socks woven of grass provided structure and baleen, the same material used to give shape to Euro-American corsets and hoopskirts, was used to make stiff but flexible soles. Knowing what i know of baleen, these boot soles likely reacted to the warmth and shaped themselves to the wearer's feet, providing a good fit along with the protection sturdy-soled boots offer. Moss and lichen could be added as extra insulation.
The parka, or atigi, would often have two layers. The inner layer would have the fur turned in against the body and the outer layer would have the fur turned in. Parkas came in a variety of shapes and levels of decoration but were always pullover garments. In the Inupiaq language, atigi is also used a a verb, meaning to put something on, not unlike how dress, in English, can mean to put garments on, or refer to a specific garment itself. Post-contact, the parka is always worn strictly as outerwear. Pre-contact, it was worn against bare skin. A well-fitting traditional parka has enough room for the wearer to pull their arms out of the sleeves and into the body. This allows them not only to take off the parka, but also to warm their arms with their own contained body heat and even get comfortble enough to sleep without a blanket. The longet cut of a woman's parka likely had to do with pants being considered masculine
Mittens were typically kept on a sinew rope worn underneath or over the parka. They sometimes had seperated fingers for the articulation needed for outdoor chores and were designed to keep snow out.