Sleeve 7/8 of length in usually leaves open the forearm just below the middle. This length is due to the demands of fashion.
Outerwear for winter are very diverse and at the moment, the range that can satisfy any taste and any budget. If you are going to buy anything from the outerwear for the winter season, in addition to appearance and wear resistance, have to be clear on what kind of winter do You expect, because Ukraine is very extensive and winter in the Carpathian mountains is significantly different from the Kiev winter and especially the Crimean.
Cuffs - an item of clothing, placing the bottom of the sleeves. In winter clothes the cuffs are used for insulation and sleeves are made of knit. Can be internal, not looking for a cut of the sleeves, and can be external. As well there are cuffs on the ribbons.