@narfcake I have some huge wedge pillows i have no cases for, and too many shirts, tho small potatoes compared to Narfcake The Great's collection. Perhaps i'll sew some shirts into wedge pillowcases. Anvil should be fine i think.
@f00l Anything would work, really. Just prewash before cutting if you're going to buy new.
@TheCO2 I prefer my shirts staying as shirts. I do admit to cutting some up into tanks; most were thrift store finds and/or mutant Anvil, in which case the desleeving process was sometimes self-inducing.
@compunaut Shirt.Woot's use of AA shirts have spoiled me, especially back in the days of $10 dailies. Super soft and unlike some other brands, stays that way.
Are there softer? Yes - the Next Level blanks that Design By Humans and TeeTurtle uses are such, but I've found they stretch more too, so prints get distressed sooner in its life.
As for other uses - the scratchy Gildans, Fruit of the Looms, and other low cost carded open-ended cotton shirts double as polishing rags. Or sandpaper. These I usually get in bulk "rag bags", aka unsold thrift store shirts.
IKEA pillow my parents bought me along with a sheet set for a graduation present... in 2009. Squishy, smells horrendous, has bloodstains from when I had dental surgery, probably 70% dead skin at this point, and I can't get a good night's sleep on anything else.