Sarah Pitt advertises in the Virginia Gazette in October of 1768 that she offers for sale "a great assortment of threads".  Some of the threads likely available were what we like to call "Tailor's" threads.  The  30/3 "Tailor's" Linen Thread - Large Spool is of a weight often used for construction in tailored garments, and in some of the more stressed areas in gown making, such as in the pleating of the skirts.  

• Wonderful for buttonholes.
• These 30/3 "Tailor's" Linen Thread - Large Spools have 150 meters/492 feet per spool.
• A 30% savings over our small 30/3 spools, great when you have multiple projects. 
• Available in Natural & White