Motorcycle denim jeans will stretch long periods of use but unlike most reinforced motorcycle jeans, the jeans will return to their original size once carefully washed. Riding jeans should fit snugly but without restricting movement. Only you can say for sure what feels right, so when trying them out, get into a riding position and make sure they feel comfortable.
You can find a great pair of SA1NT women's blue skinny jeans or women's black skinny jeans that have great stretch and look good once you step off the bike. With elastane for stretch and Dyneema for abrasion resistance and toughness with a high-rise cut, the best motorcycle pants allow the freedom to move on and off the bike at ease.