An eco-conscious New Jersey art teacher is giving her students a valuable lesson – by wearing the same dress for 100 school days, according to a report.

Julia Mooney wants to teach her kids at William W. Allen Middle School in Moorestown, located just outside Philadelphia, about sustainability, WPVI reported.

“The fashion industry is a huge polluter,” Mooney told the station. “It’s very wasteful and for what? So we can look cool every day?”

So far, Mooney has gone seven days wearing the short-sleeved gray frock, which she washes.

She has a second one as a backup and wears an apron over her outfit to keep it from getting stained.