He first made brown duck coveralls for the American railway workers, basically revolutionizing work clothing for the working class. Hats off to you Hamilton! The Duck Bib and Brace is a total monster of a product and almost unbreakable! In the 1929 Carhartt catalogue, these coveralls were featured, speaking of a “new 10-ounce brown duck bib.” That they still exist today, is no surprise as they are absolutely warriors of workwear and coveralls. Stiff, strong material that softens up with washes, you will not to replace these regularly. What you pay for these, will be repaid over and over again to you. The Duck fabric is 12 ounce fabric (that is super, super heavy and strong), this equates to 407g of material and is 100% cotton. Adjustable front elastic suspenders and a multi compartment bib pocket for storing parts. Two large front pockets and strong front zip compliment the strong material. It has a left leg hammer loop and double knees with cleanout bottoms. It also features two reinforced back pockets and triple stitched main seams.