Des has some cute ones - I don't know if they would be heavy enough for what you are looking for though.
There are several others too that have PJ's, but I can't remember who right now. Also, tons of websites have some cute ones - like dog.com!
I have some winter ones, but they are 2 pc. (size XS - light blue w/ white lace) and a night shirt w/ white lace (size S).
Asking $5 for night shirt and $6 for PJ set (plus $1.50 shipping)
OR $10 for both (w/ free shipping)
Project191s.jpg Project189s.jpg
((sorry for the dark pictures))