I just purchased 2 red skivvies and 2 pairs of track pants on sale. Using iron on transfer paper I printed up ‘Thing 1 and Thing 2′ templates and ironed onto the front of the skivvies.
I purchased red socks (be prepared to throw away afterwards due to holes) and placed them on the ‘outside’ of my childrens sneakers (they lasted the day).
I purchased 2 blue spiked wigs from a costume shop and to finish off. I used black liquid eyeliner for lashes and nose, make up plus a bit of pink blush on the cheeks … presto a Homemade Thing 1 and Thing 2 Costume.