Things you probably don't know about Poplin shirts and Patagonia Organic Cotton Slub Poplin Shirts Posted on 9 November 2020 By Nanda Posted in Organic, Patagonia, PatagoniaSG 0 Patagonia Organic cotton slub poplin has all the characteristics the original poplin has with more textured face and additional durability because of the slub yarn to make the shirt last longer.