It takes about 2 seconds to get my cell phone out. Two rings max. If you angle the pocket towards the open apron edge it is so quick most people don't even notice you reaching under the apron.

And I would dare a pickpocket to get my passport out of that pocket. Even if he knew where it was.

If anyone questions you about reaching under there just show them your phone and say "See, it's my phone. and it's on vibrate. call me." That always gets a chuckle. Or a knowing smile.

If it is no big thing to you, most people take no notice. However I have had women ask for my number just to call by bluff. So I give them my card with the number and tell them that if they call me we will have to get married.

Light honest humor goes a long way when kilted.

You can also tell people that that is your "Anti wind gust modesty protection system."