When I was in college I had to take a parenting class in which we had to write a paper outlining our goals for our future family. Let me tell you that reading that paper now that I have kids is pretty hillarious. I was so clueless about what a real mom did. Most of the goals I set were completely unrealistic. One that I did write down, which I have actually had for a long time was under my "finacial" category. Under that category I said that I would live frugally, and could even make pajama pants out of bed sheets if necessary. I think I have been pretty good at living frugally and I finally crossed off the "making pj's out of bed sheets" goal. Think about it-what is more comfortable than a worn in sheet that keeps you cool in the summer and warm in the winter. Not all sheets are created equal but when you find a good one that feels soft and smooth and cool and comfortable you are doomed to want to just hang out in bed all day. Well why not just take the sheet with you? I didn't make these pants because we are too poor to afford regular pajama pants but because I was shopping at our thrift store and happened to find one of those "perfect" sheets that was soft, and smooth and cool feeling and I loved the pattern. I knew exactly what I had to do with it: pj's for my girls.
These are pretty much as easy as you can get. You will need 1 bed sheet (size doesn't matter if you are making kid pants but it might if you are making adult pants) and a pair of pants to use as a pattern (ones that currently fit the same way you want the bed sheet pj's to fit). You will also need 3/4" elastic and small piece of ribbon.