The Scottish Operative Tailors' and Tailoresses' Association was a trade union representing clothing workers in Scotland.
By 1867, it had 4,500 members in 84 branches, although these initially had a great deal of autonomy, and many of the union's activities were localised until the 1890s.
Already in the 1860s, its secretary and the editor of its journal worked full-time for the union, while its treasurer and president each received £12 per year.
Membership of the union gradually fell to 2,500, and remained at this level through the 1870s and 1880s, only recovering to over 4,000 in the mid-1890s.
While this membership remained concentrated among the best paid tailors, it had also begun to recruit skilled workers in clothing factories.