I haven’t seen this mentioned before, and think its a very noteworthy tip if you perform in a suit. When you are looking to buy a new suit, make the sure the main thing to look for (other than buying it from a charity shop) is that the outside jacket pockets have no pocket flaps.
I always find pocket flaps get in the way, and without them they make deck vanishes, ditching props and loading/stealing props so much easier.
If you had to you could have them tailored off, or have them sewn down inside the pocket (even just tacked down for a none permanent solution). Or, you could just tuck them in the pocket, but during the course of performance its very easy for them to come back out over the pocket. Get rid of them and you’d be pleasantly surprised how much easier your performing life becomes.