Most of its members were Jewish, although all tailors were eligible to join.
Given that the large majority of its members were Jewish, union business was conducted in Yiddish.
In 1912, it grew enormously to have 3,235 members, thereafter remaining at roughly this level.
On the urging of the Trades Union Congress, it discussed a possible merger with the Amalgamated Society of Tailors and Tailoresses and the Tailors and Garment Workers Trade Union, but it decided against joining either union.
However, in 1939 it did amalgamate with the National Union of Tailors and Garment Workers.