I was looking around for ideas on how to make a Mario Bro’s costume because my almost three year old asked to be one for Halloween. I had already figured a blue overall and red long sleeve shirt would cut it. I just need to make him an oversize red hat. But I also found this other idea on Instructables. Then I started poking around and found a few others that I thought would be neat you show you:
Here is a simpler one Lego Halloween costume
There are tons more available and some are amazing like this Transformers costume.