I have had some shirts made when Harris Reiss was one of its salesmen. (He has staked-out on his own.)
The shirts were good value. Some were made in Hong Kong and some at one of the Gambert factories in New Jersey.
J. Lucas is a MTM outfit. It clothing is made by outside factories and workshops. It has an actual showroom on Madison and 35th Street. It also sells to customers in their homes and offices. It started-out in this manner.
I believe that Martin Greenfield , Adrien Jules, and Primo make its suits. I believe that the choice in vendors allows for the best customer fit and as well as a wide price range. The stable of vendors change from time to time.
It seems that its customers are mostly middle level management and professionals. The pricing is value oriented for middle management.
Here is a link to a story about founding of the company out of the Custom Shop's bankrutpcy. See http://online.wsj.com/article/SB991777815119796926.html#printMode