The belt

At what point did wearing a belt stop being the norm? There was a shift, I just don't remember when. We went from tucking our shirts in and wearing belts to no belts and leaving the shirts out. I think the latter looks better but silly me forgets that I could still wear a belt with my shirt out, to help keep my pants up. DUH. So at work the other day I was walking around like a dork cuz I kept having to pull up my pants!