I've personally never been a big fan of half aprons. Thought the only messes I made while cooking would need a full apron to protect me. However, I have always thought half aprons were very cute, just not practical. A few nights ago I made this AMAZING recipe from http://ellenaguan.blogspot.com/2011/11/avocado-chicken-parmigiana.html and like the amateur cook that I am, I didn't wear an apron at all, and got pasta sauce all over my pants. It was at this time that I realized had I been wearing even just a half apron my pants would've been safe! So, there it was, my inspiration to start making half aprons!
Here's a picture of my first one -