Last year's Carters $6 PJs. Affiliate links used in this post.
I buy them every year and am always thrilled with the quality, as well as how they look in pictures. They scream Christmas.
This year Carters is also offering adult sizes for $10 (this is the third year!) and you can bet I bought a pair for me.
These sell out right away every year, so go to their site and shop now. If you are unsure on sizing, I would size up or buy two sizes. You likely won't be able to find the sizes you need after today. They also have 50% off the whole store and everything ships free.