So my kids are totally into Mario (and other Wii games), so we have Mario and a Luma for this year's costumes:
I made the hat, and made the bib part of the "overalls" - it tucks into his jeans in the front, and I safety-pinned the straps to the back of his jeans - makes for easy-off for bathroom breaks! Bought the shirt and gloves.
This one I made from looking at images online - here's a good source if you don't know what a luma is:
Thanks for looking!