Women’s Lucky Brand Ava Legging Sz. 4/27

Gently Preowned Lucky Brand Jeans. Sz. 4/27. Ava Legging. Mid rise. Excellent condition except the button is missing. How and why? It came off in the washer or dryer and I haven’t worn them since. Practically brand new. Please see pics for measurements. 👀Thanks! 🧘🏼‍♀️🫶🏼