Lululemon Black, Short Sleeve, Hip Length, Breathable Mesh Exercise/Yoga/Activewear Shirt/Top, Size 2. Top of collar to hem: ~20"; armpit to armpit (laid flat): ~15"; across hem, laid flat: ~14"; armpit to hem, laid flat: ~17". The tag has been removed, so I looked up size guidance on Lululemon.com, and this matches up with a Size 2. See pictures. Payment is expected within 3 days of end of auction. If payment is not received within 3 days, seller will report buyer to eBay for nonpayment so as to quickly relist item. If you have any questions, please ask BEFORE bidding. Buyer pays all shipping costs; for choice of mailing options below. Check out my other auctions for similar items.