Sexy teacher or sexy secretary costumes are probably the easiest costume for women to put together because they are just made from every day clothes. The most common style is a short dark skirt with or without a slit plus a tight white shirt. Then simply add high heels and clear glasses with dark rims. For a teacherís costume for men you will need black trousers with a white shirt. You will also need a special type of black robe that has arm holes but no sleeves. Two accessories that you might want to add are a motar board hat and a cane for dealing with naughty students.