How to Wear Flannel. When we talk about casual and comfortable clothes that are also stylish the first thing that pops into the mind is a flannel outfit. Be it a guy or a girl, almost everybody has flannel apparel in his or her wardrobe. Milan, Nice, Lady, Outfits, Casual Outfits, Winter Outfits, Casual, Flannel Outfits, Flannel Shirt Outfit