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I'd recommend a Smith & Wesson 642 with a pocket holster in your apron.

I served tables for a couple of years in college, and never once had somebody else reach into my apron. You just can't take the apron off and leave it somewhere. The 642 is light enough that it won't tug or print.

This would give you optimal access to the firearm. If you use that pocket of the apron for anything else, just make sure it's clean. Make that your pen pocket and clip them all to the edge so that they are accessible from the outside. I had a couple of spills during those years - but nothing that would have permanently damaged a revolver. They're easy to clean, reliable, and lightweight.

Let us know what you end up trying!