"Just" the stretch thing? Once you reach a certain level of performance, it will have a big impact, whether your suit has "just" stretched out.
Metal suits have to be crazy tight to have proper support, I lift @ 220 and have used 44 metal king for deadlifts, I changed that for a Titan. Why? Because the fabric is much thinner in a metal suit = low amount of support and low durability. The seams run, the fabrics gets holes in the hips... Why bother when it's not as supportive anyways?