Sleeve 7/8 of length in usually leaves open the forearm just below the middle. This length is due to the demands of fashion.
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.
Green is in the middle of the visible spectrum to the human eye (the average color in the rainbow). This is the only color that has shades of both cool tones and warm. Few would call green my favorite color, but the reality is that this color is less likely to irritate the human eye and even can soothe. Dark tones of green outerwear can make a person invisible, the bright shades on the contrary, can attract the eyes of others.