This is as formal as it gets, without a cummerbund and yards of satin and lace.
Business-suit and tie for men, no exceptions.
Women have a bit more leeway and can wear skirts as well as nice blouses with pressed trousers, but clothing should be tailored and well-fitting. Closed-toed shoes are a must, as are pantyhose. Avoid too much flashy color, such as an all-neon suit. However, a splash of color in a tie or scarf is appropriate. Styles should be classic, with nothing too trendy or obtrusive.
Accessories such as jewelry must be simple and traditional. Piercings anywhere besides earrings for women (one in each ear) must be removed. Tattoos must not be visible. Hair should be clean-cut and carefully styled. No messy hairdos or days-old facial growth. If facial hair is worn, it should be groomed often and already exist during the work-week.
Many companies encourage women to wear subtle make-up, however, they cannot legally force you to do so. If you do choose to wear make-up, choose subtle colors and avoid sparkles or flash. Shoes should be heels for women, or dressy flats, and men should wear nice polished shoes.
This is the most common dress-code you will encounter, and the interpretation of this term is the broadest.
In general, consider the following:Clothing should be conservative and nice. Button-down shirts, trousers, blouses, sport coats, and skirts are suitable. Shoes need not be patent-leather and polished; loafers or similar styles are acceptable. Avoid sneakers and sandals, and in most cases closed-toed shoes for women are still required. However, styles can vary toward more trendy looks. Keep skirts knee-length or longer.
This is the most poorly interpreted dress code option. Casual still means work-appropriate, so your clothes must still be neat and conservative.
Showing a lot of skin (like a bare midriff, or too much cleavage) is always a no-no. Avoid sweats, cut-offs, tank tops, and flip-flops. Sneakers are okay, as long as they are new-looking and clean. Pair jeans with nicer shirts or casual button-downs. A T-shirt is sometimes acceptable, if it is in good condition. Avoid t-shirts with slogans or ads for things such as beer companies. Hair, make-up, and accessories can reflect more personal style, as long as it does not get in the way of your job (such as hair dangling in food, etc.)
Whatever you wear see that it fits you well, because that is what, matters most. Don't just wear anything with the label 'Brand.' Opt for anything that fits your style and physique