I buy all my work clothes through sierratradingpost.com, usually for at least 70 and sometimes 90 percent off retail. For suits, a visit to the tailor perfects the experience. The clothes are usually very high end. Compare to Neiman Marcus. You can get a great suit for a couple hundred, and sometimes the craziest deals are on clothes for people with uncommon body sizes like you.
I have no interest in STP, or even know anyone who does, other than purchasing tens of thousands of dollars of merchandise over 25 or more years, and have never had an issue.