Q: I was recently invited for an onsite interview at Yahoo!. The email confirming my interview wrote: “Yahoo is a business casual attire company; no suit necessary.” What does it really mean?
A: In BeyondJob staff’s experience there is no accepted definition of business casual wear. Furthermore, its interpretation differs widely among organizations and is often a cause of confusion.
“In general, business casual means dressing professionally, looking relaxed yet neat and pulled together.”
– The New York Times quoting Monster.com’s definition.
Women:
A reasonable length skirt (not mini-skirt) or full-length trousers of a non-jeans material combined with a top (such as a dress shirt, polo, or sweater set) is considered acceptable. An informal dress with appropriate skirt length is also acceptable.
Men:
A combination of collared shirt (such as a dress shirt or polo shirt), cotton trousers 
(such as khakis or dress jeans) belt or no belt, and dress shoes (such as loafers) with socks is generally acceptable.
Unacceptable for either gender:
Gym clothes, fleece jackets, rumpled or ripped clothing, miniskirts, underwear as outerwear, inappropriately revealing attire such as bare midriffs, and flip-flops. Many corporations also frown upon open-toed shoes and any shorts.
Neckties and cufflinks are not required for business casual dress. Only the position that are customer facing, business casual should accommodate a tie if needed. Otherwise, a tie is not expected (software engineer, hw engineer or others).
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