Typically with Westside stuff DE squats are done with about as wide of a stance as you can tolerate, and using suit bottoms just keeps it from completely destroying your hip joints. It's pretty common to warm up raw and then use a suit straps down for all the main sets on DE day, and then actually do all your raw work on ME day. So far I've only gone straps up once, but the guys at Super Training that I go to on weekends seem to go straps up maybe 1-2 times a month, full gear maybe every 10-12 weeks from what I've seen.
I do probably get 10 or so lbs from the suit bottoms for DE stuff, from what I've noticed so far.