Sarah Pitt advertises in the Virginia Gazette in October of 1768 that she offers for sale "a great assortment of threads".  Preceding cotton thread, linen thread was used on linen, as well as wools and blends.  It came in a variety of weights to suit the project.  

• This 50/3 Linen Thread - Large Spool is very fine, making it perfect for lightweight linens and finer sewing.
• These 50/3 Linen thread - Large Spools are 225 meters/738 feet of thread.
• A 25% savings over our small 50/3 spools, great when you have multiple projects or don't like running out!