Gone are the days when college students could dress up without fear of being reported to a bias response team. In recent years, more and more campus leaders have made it their mission to warn students what not to wear.

Fliers, memos, workshops and more impart the admonitions.

"Unacceptable costumes" listed on a University of St. Thomas diversity flier are "wearing Native American headdresses, dressing up as a 'Mexican' by wearing a sombrero, dressing as a 'geisha,' any form of blackface."

"Cultural appropriation is defined as 'the act of taking intellectual and cultural expressions from a culture that is not your own, without showing that you understand or respect the culture,'" explains a University of St. Thomas diversity memo to students.