Flannel

Low: https://oldnavy.gap.com/browse/product.do?pid=739570082&vid=1&tid=onpl000017&kwid=1&ap=7&gclid=Cj0KCQiAzMGNBhCyARIsANpUkzOI6Y-iDQB-og0IgElCbnkPR16zFsZ9rFpX5aU5xIJix9uZa_T9VQ0aAm7UEALw_wcB&gclsrc=aw.ds&modelSize=M#pdp-page-content (Gap)

Mid-Range: https://www.abercrombie.com/shop/us/p/boyfriend-flannel-shirt-45468821?seq=04&source=googleshopping&gclid=Cj0KCQiAzMGNBhCyARIsANpUkzOjnhmNPIB9nDCG2oLaHvwHzaUEdgNIr_TxoAbxaZmwBo08iHfA-DMaAqnIEALw_wcB (Abercrombie)

High: https://www.madewell.com/flannel-oversized-ex-boyfriend-shirt-in-fuller-plaid-99106358278.html?source=googlePLA&noPopUp=true&srcCode=Paid_Search|Shopping_NonBrand|Google|MWGGBS00002_99106358278_13609001016_127613610607_552974700477_c__online__9013193&gclsrc=aw.ds&&gclid=Cj0KCQiAzMGNBhCyARIsANpUkzMbtIDRM1NvN78u66QkfzbSN7XHQIC9aVk2DZE7LIglE1HlM6h8ARQaArclEALw_wcB&gclsrc=aw.ds (madewell)

Sustainable: https://www.patagonia.com/product/womens-long-sleeved-organic-cotton-midweight-fjord-flannel-shirt/42405.html?dwvar_42405_color=TUBI (Patagonia)