I definitely understand what you're going through. They do have some nice patterns in plus sizes though. I have several I bought on sale forever ago that I've never gotten around to using actually. My only suggestion is to be sure and measure yourself and not go by your regular size. I had to go up a couple sizes to get the pattern to work for my actual measurements. Not sure if that means I wear clothes too tight normally (they seem to fit ok) or if they just work the sizes kinda funny. Good luck!
I can't wait to try this! I made my mom some lip balm from a Bonne Bell kit YEARS ago and she swears by it. I'm sure it's nothing better than what you made. Time to start experimenting for her birthday/Christmas!!