For girls wearing women's sizes, try Hollister or TJ Maxx/Marshalls.

It can be hard to find this out of kids sizes, because a lot of the women's tops are cami style, or too open, or whatever - harder to find a "regular" set.

I've had luck on Amazon, separates from Cotton On, Aerie....

What size is your DD? We squeezed in Carters and Cat and Jack up to the largest size. They went a little further than I thought!

My DD has gotten a few pairs at TJ Maxx ladies small. And a cute snoopy pair at H and M.

PP. Forgot to mention...long sleeve gray, black, navy, and red t-shirts from anywhere generally pair well with fleece pajama pants purchased anywhere to make a pajama set that is Carters-reminiscent.

Walmart

Lands End up to size 18. Worked for my boys until mid-high-school.

Carters may have larger sizes online vs. the stores. Especially right now. It's peak holiday pajama buying season.

I have occasionally bought larger sizes at Walmart & Walmart.com.

My older son is college age now and 5'6. I have bought him cheap fleece pajama pants from Dunham's Sporting Goods (kind of like Dick's). And nice ones from Lands' End Men's (Size S).

How old??

Gap Factory

American Eagle/Aerie has lots of lounge/sleep options.

Target should still be ok, Old Navy, Gap.

Still finding things at Target, Old Navy, etc.

My kid likes wearing random summer camp t-shirts and flannel bottoms from Old Navy or Gap.

Lands End or LL Bean

Vineyard vines has some nice ones

DD is outgrowing kid sizes, but would like kid style pajama. Aka themed shirt + pajama pants, but not tight. Where do you find these? Previously, shopped at places like target, carters.