It was made of completely transparent gauze

(chapter originally by ObedientLorelei at writing.com)

Mackenzie stared at the rectangle of transparent gauze in disbelief, cries of anguish from all sides confirming that the other pledges had discovered the same thing. She swiftly wrapped the toga around her curvaceous body and looked down to see that it was exactly as she had feared: the thin fabric did nothing to conceal her supple flesh and both her pert pink nipples and flame-red landing strip were entirely visible.

Worse still, the silky smooth material didn't seem to want to stay put and wasn't quite long enough to tie in place, so she had to grip the hem firmly at all times to stop the toga sliding off her slim frame completely.

Looking around, Mackenzie saw that the other pledges were in equally dire straits, having to hold their practically-invisible togas on, making it much harder for them to conceal their intimate secrets. Meanwhile, the sisters were falling about with laughter, delighted at the success of their cruel trick.

The sisters' blonde spokeswoman wiped the tears of mirth from her eyes and told the togate teens to return to the sorority house that evening to learn about their next task. As the embarrassed young women turned to leave the garden, she called after them that they were expected to continue to attend all their usual lectures, classes and extra-curricular activities, including eating in the cafeteria, so hiding in their rooms until the end of the week was not an option.

Mackenzie shuffled out, past the assembled crowd, trying her best to keep the toga on and her pudenda covered, not that she could do anything about her delectable derriere. Groups of boys broke off from the mob to follow the girls as they left, making lewd suggestions and requests. With no shoes, Mackenzie knew that she couldn't escape them.