Slim fitting suits: Suitsupply alternative? Only J. Crew Ludlow?

While I like the styling and fit of Suitsupply's suits (Washington, Lazio), I'm worried about them constantly discontinuing old fabrics in favor of new. I tend to wear pants much quicker than the jacket, so it feels scary to plomp down $500+ knowing that a year from now, the suit will be completely unusable because the pants had worn out. Are there more reliable manufacturers who continue to keep their fabrics on rotation for longer, have slim-fitting suits, and also offer suit separates apart from J. Crew (Ludlow line)?

Slim fitting suits: Suitsupply alternative? Only J. Crew Ludlow?