NWT SI-IAE navy linen/cotton LS knit shirt

NWT SI-IAE navy linen/cotton long sleeve knit shirt w/hidden buttons. This is a button down shirt, but very casual w/the fabric. Knit collar, detailing on arms and down back & slight hilo. Wear alone or as jacket, tied at waist. I believe this is a sample piece since there are no labels. Please check measurements this runs like M/L.