I haven't used a coin purse since I was a little kid. But I couldn't resist trying to make one, especially because I found this gumball-like purse clasp from SugarCarousel on Etsy. I originally tried a more complicated, pleated purse, that was puffier, but it was a bit too complicated for my beginner skills and I sadly failed all 3 attempts. Lining's are always the trickiest part for me, because I always end up sewing it wrong or getting confused as to which side should be facing out at certain points in the process. In the end, I pretty much followed these instructions from U-Handbag, with the only difference being my clasp was of the "sew-on" type, not just glue but it still worked. Fabric is from from Joann's.
I also discovered this awesome website for DIY bags during my search.