What is the point??
What is the point of shooting through a pocket, or a purse???
The point is to conceal, until the last moment, the fact that you are armed. To take the bad guy by surprise when you don't have the element of surprise or where draw and present runs you the serious risk of getting shot, first.
it is, literally, shooting from the hip, and one can only expect a hit at about double arms length. MAYBE its a good hit, maybe its not, maybe even a miss. The point is to get a shot, maybe even more than one, in order to change the situation, with the intent of giving you the time needed to draw, aim and fire, or run, or whatever else you feel is called for.
The conventional semi auto is at a serious handicap inside a pocket, and not JUST from restricted slide movement, but also, where is the fired case going to go??? conditions might be just right so the fired empty doesn't clear the ejection port, even IF the slide is not hung up on clothing.
Here is where the DA snubnose shines, especially those with an internal or shrouded hammer.
One friend I know recommends a baggie, too. Not the good ones with the ziplock, NOT freezer bags, but the thinnest, cheapie sandwich baggies. Easy to poke through with your trigger finger, and unlikely to hamper the mechanism of a DA revolver, and shredded on the first shot, generally.
Your call, of course, but the lint, grit, (actual tiny rocks) that somehow gets in my coat pockets could mess up even a revolver's function, of course at the worst possible time...
If you are going to practice this kind of thing, I suggest you practice getting your gun OUT of the pocket (after firing) as rapidly and smoothly as possible. This may involve getting you out of the coat. If that first (or second, if you get one) surprise shot doesn't end the problem, you are going to want that gun OUT of that pocket, really quickly.
And, that's not considering the possibility of fire...