Lululemon Home Stretch Tank Top in Submarine

Lululemon tank top in a deep teal color. No size labeled, measures 15” across the bust not stretched and can stretch to 19” ish across. Measures 13” across the waist and can stretch to 17” ish across. I would compare it to a similar tank top that you own to best estimate the fit. It seems to be around a size medium! In gently worn condition.