Dress up or dress down with the Johnnie-O Duncan Polo Shirt in Blazer. The Duncan polo shirt by Johnnie-O features a washed garment dyed two button polo with a rib knit collar, sleeve bands, an applied placket and a side vent inside taping. Logo applique at chest. This Johnnie-O polo shirt is made from 97 percent cotton, 3 percent pique. Johnnie O clothing is easy to care for, just machine wash cold for best results.