What is the ruling on a woman wearing very tight clothing in front of non-mahram men? Is this considered a major or minor sin, and is a woman held accountable if every man looks at her?

The Muslim woman who wears tight clothing in front of non-mahram men commits a sin, because it is a form of tabarruj (displaying oneself) and falls under major sins. It also falls under the category of inviting to evil and promoting it. She bears the burden of her action and the burden of those who act upon it.