BWT, where are we buying pajamas?

I’m a fabric snob and I don’t like wearing synthetic fibers, especially to bed. Historically I had been getting 100% cotton poplin shorts from places like old navy, gap, muji + whatever oversized 100% cotton crew neck tee shirt from like a concert, sports event, volunteering etc. I can’t find cotton shorts anymore! (Actually I am finding cottton poplin boxers for men at these same stores but no longer any shorts for women which is so annoying and I’m tempted to see how a pair of men’s boxers may fit?) I’m also expecting my first baby soon and plan to try to breast feed so looking for more tops with buttons instead of the stiffer crew neck t-shirts I have been wearing. Any recommendations?