My friend and I were originally going to make and wear a different costume, but those turned out to need a little more time than we had available. Knowing that, we decided to pick something easy and settled on the Great Saiyaman and Great Saiyaman II.
For the most part, it was simple. The sewing on the actual costume took little time at all. But those helmets! I've never personally made anything like that, let alone from scratch, and it turned out to be quite challenging.
I'll eventually want to make the helmet bigger (since it folds down my ear and presses into my eyebrow) and fix up the visor, but I think it's pretty good for a first attempt!