My mom used to make all of our costumes. We had the BEST costumes. It was either homemade or those horrible plastic shirts with a mask. I was very thankful for my homemade costumes. Store bought costumes are SO much better now but I still love a good homemade costume. Here are some that I've seen and loved from around the internet!
A perfect army man from Wild Ink Press
Scuba accessories from Real Simple
DIY Skeletons from Finley and Oliver
and airplane/pilot at Oh Happy Day
or a good old LEGO from Country Living