Guidelines for three categories of "business casual": Level A is "almost a suit," Level B is relaxed separates and Level C includes less structured pieces.

Level A for women could mean replacing a skirt with trousers or wearing a woven top or lightweight sweater under a jacket instead of a blouse.

For a more relaxed Level B look, women could create a mix-and-match wardrobe revolving around blouses, lightweight sweater sets and casual blazers with khaki pants and skirts.

Level C is clearly casual, meaning women's knit shirts, skirts and blazers worn with classics like chinos, white blouses and cardigans.