I crocheted a warm, button-front vest pour moi back in 2015, and it’s awesome, if I do say so myself. I didn't use a pattern, just kind of winged it and figured it out as I went along.
But it didn't take long for me to decide after wearing this that the vest really, REALLY needed pockets. It took me two years to finally get around to adding them, but at last it now has two patch pockets on the front.
To make the pockets I modeled them on the patch pockets of my husband's Carhartt vest. Using the same double crochet mesh stitch as the vest itself, I did a fdc of 24 stitches wide and then worked the pockets from the bottom up.
But I also wanted these pockets to be able to hold anything I put in there, so I knew it would be important to line them with fabric. That way even tiny coins and the like would not be able to fall out from between the crocheted stitches. I used a remnant of this adorable penguin fabric to make the pocket liners. I tacked the liners to the front of the vest and then sewed the crocheted pockets over the liners. I sewed around the pocket opening to secure all the layers together there, and that's all there was to it. I'm a lot happier with the vest now that it has pockets.
Living in California, this vest is the perfect thing to wear outdoors on just about any winter day, so I'm sure I'll get lots and lots of use out of it.