I needed a warm, wind and waterproof jacket for road cycling. I guessed my size and just went for the biggest - chest/bust measurement bigger than other measurements - could potentially have gotten a better fit (arms and body are a bit big for me) but I ordered at the last minute and chose speed of delivery over fit. Delivery was very quick. The jacket kept me warm and dry on a long wet and windy ride - Velcro from my gloves caught on inside of sleeves but otherwise this was superb. Just as warm and waterproof after being washed and in French rain 🤣