This blog has a tutorial for a men's pioneer shirt tutorial using two ready made shirts. It is an interesting concept and with a little modification (no elastic in the sleeve) would probably work nicely for a shirt which would probably be covered by a vest anyway.
Read the tutorial here. http://lisascraftystitches.blogspot.com/2013/05/mans-pioneer-style-shirt.html
You can also create a PDF of the page to save it on your computer by using http://www.pdfmyurl.com.