When the dress code is business casual it's not appropriate to wear your favorite old t-shirt, ripped jeans, ratty sneakers or flip-flops. Remember the "business" part of business casual, and leave your old comfortable clothes at home; outfits should still be clean, pressed and fit properly. Men do not have the option to skip shaving, wearing socks or leaving the belt at home. Women should not wear anything that's too tight, flowing, short or low cut. Keep makeup and hair looking natural. This isn't the time to come in with orange fingernails, wacky earrings or a wild hairdo.