INSIGHT Men's Soft Pastel Colors Grungy Short Sleeve Button Up Shirt Sz Small?

Insight Men's Soft Pastel Colors Grungy Short Sleeve Button Up Shirt Size tag is missing but based on measurements I’m guessing it’s a Small. Please see photos of measurements Approximately 30.5” length. 21” pit to pit. 17.5” shoulder to shoulder One of the buttons is different but it has the spare button you can switch out. There’s a little damage on the back as shown in the last photo. Has a nice grungy lived in feel to it with really nice pastel colors