Any advice as to how to straighten this out would be appreciated:

This is a SWK Nightstalker Standard (last years model)...the problem has to do with a couple of pleats in the back that seem to "wander"...that is that they seem to have stretched along the edge of the pleat and thus don't hang straight. Bear in mind that these are probably in the area that gets the most weight when I sit down, particularly when I'm driving, and I do try to sweep the pleats underneath me so as to not squish them but can't tell how well I'm doing in this regard.

Ironing doesn't seem to adequately remedy the problem....I'm ironing from the selvedge up toward to waistband with the iron on the lowest setting and some steam. Would I have better luck washing it and laying it out flat to dry with everything nicely flattened out and even? I know that hanging with weights has been suggested but I don't think that that would work with the acrylic material which seems to stretch a bit.

Best

AA