I walked downstairs and into the sorority's common room, dressed in the costume that had been chosen for me; I was dressed in a private school uniform, a couple sizes too small, but not too revealing. All-in-all, it could have been worse; the other three girls were dressed in costumes that either barely covered them, or were practically see through, or both. I was amazed that I could clearly see the nipples of the girl standing to my left, Brenda, through the sheer fabric of the sci-fi costume she was wearing; I couldn't understand why she hadn't put on a bra.
Before I could ask her, the 'sisters' came in, dressed in their costumes; none of them as revealing as ours, of course. They surrounded us and waited for the 'head girl' to approach us. When she did, she stood right in front of the four of us and addressed us all. "Tonight we will attend the annual Halloween costume party. It is a tradition of this house, that any pledges wishing to join us, will wear the costumes chosen for them by us, to this party." She paused and walked to the other end of the line. "At the end of the party, all pledges will return to this house, for the elevation ceremony; at which time, you will be made a full-fledged sister in this house."
She placed a hand on the first girls shoulder and said, "Pledge Stephanie, you shall go with Sister Amanda and her group." I saw Stephanie leave with three sisters through the front door. "Pledge Carla, you shall go with Sister Maria and her group." Again three sisters left with the pledge. "Pledge Brenda, you shall go with Sister Elena and her group." Brenda left with three more sisters, leaving me with the 'head girl', Tracy, and two other sisters. Tracy laid a hand on my shoulder and said, "And you, Pledge Ashley, shall go with me and my group."
Without saying a word, I followed them out in time to see the car with Brenda pull away. I got in the back seat of Tracy's car, and buckled up; ready for the ten minute drive to the party. I sat back and relaxed, thankful that after tonight, I would be a full-fledged sister, and wouldn't have to do any more stupid rituals.
We had only gone a couple of blocks down the road when the Sister in the passenger seat, who had been watching me the whole time we were in the car, pointed at my legs and shouted, "What are those?"
Thinking that there were some hideous bugs crawling around my legs, I tried to move, but the seat belt held me firmly in place; so instead I spread my legs as wide as I could, hoping to see what it was that had attracted her attention. When I saw nothing, I asked, "What? What is it?"
She reached back, lifted the front of my skirt up with one hand, and pointed at my crotch with the other. "What are those?" she repeated.
I looked down, and saw nothing out of the ordinary. "I don't see anything." I said.
"Those panties!" she screamed.
"What about my panties?" I replied, completely confused.
"Why are you wearing them?"
I hesitated for a minute trying to figure out where this was going, but couldn't; so I said, "Why not?"
She turned to the girl sitting next to me and said, "I'll bet she's also wearing a bra; check her."
Before I could do anything, the girl next to me had lifted my shirt up. "You're right, she is."
I felt the car pull over, and the two girls released my clothing. Tracy turned to face me and said, "Why did you decide to wear underwear?"
I looked at all three of them before answering, "Because, the costume you gave me didn't have any, so I wore my own."
"What were you instructed to do?" Tracy asked me.
"I was instructed to put on the costume that my sisters laid out for me."
