I was at my local Target today just browsing/ Christmas shopping. I walked through the sleepwear section, and spotted what Target is calling a Union suit. It is basically a 1 piece sleeper without feet. They came in red with white dots, grey and pink stripes (the one I wanted), and blue with snowflakes.
I wanted the grey and pink one, but they only had an x-small and xl, neither of which I can wear. So I bought the red one in a medium, so I could fit padding.
These are in adult sizes, so for those who can't fit the kids sleepers, these may be a nice alternative. I paid $20 for the sleeper.
Here is the link on Targets website
Target : Product Detail.
Here is a link to what I got.