I purchased a Sig 1911 a few weeks back. On the way home from making said purchase, the wife and I had stopped for an unplanned lunch. I wasn't going to leave my new purchase unattended in my car (even if it was locked) so I shoved it down my waist band (unloaded) just to keep it on me. Seeing how I didn't have a holster yet. The entire meal I was fidgety, thinking to myself "how the hell do gangster do this". Not worth it!
Sounds like you forgot to fasten your belt below your butt.