I ordered the black jacket in the UK14/USA12/EUR42 size. I normally wear a medium in clothing and I'm Petite 5'2 and weigh 122 pounds. The jacket has a very nice fit with a really cute small pocket on the upper sleeve (large enough for a credit card) . Also note that I received input on the sizing from Backcountry before I placed my order). When I received the jacket I hesitated because the jacket was so light weight and I was unfamiliar with the brand name but because it was so cute and fitted so nicely - I decided to wear it that evening with a sleeve-less jacket that was 75% down and once I started moving around I warmed up considerably in the jacket. Since I liked this jacket so much and the cost was relatively low based on other items in my closet I attempted to order one in red but it was out of stock in my size. I'm glad that I purchased this jacket because it gives me more options when I'm hiking at night or in cooler weather. Keeping in mind that I live in Southern California so my perspective on weather is somewhat different :>). However, when I go to the Mountains where the weather is much colder and snowing; I will use it as a base layer. With the said the jacket is definitedly a keeper.