I'm a muji t stalwart but they do shrink. Was buying L for a while as a true medium and now I'm finding I prefer XL. After a wash the L basically turns into a medium. eh. I go for the organic ones, they feel slightly nicer to me. possibly projected.
weird. I guess maybe it makes sense if you don't live in a major city, but for me i think most of the fun in looking at clothes these days is looking at second hand and vintage and looking at unexpected labels.