1) High-grade muslin 2) Woven fabric 
Longcloth refers to a plain cotton cloth originally made in comparatively long pieces. The name was applied particularly to cloth made in India. Longcloth, which is now commonly bleached, comprehends a number of various qualities. It is heavier than cambric, and finer than medium or Mexican. In the early 1900s, as it was used principally for under...
a fine, white, cotton cloth, of plain weave; high-grade muslin.