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Betsy had decided, in the end, to go as her teenaged self. She'd started wearing practical clothes since all this had started, but she managed to find a skirt (which she had to keep tugging down because it was just a little too small for her) and blouse, both in a close enough shade of pale pink to kind of go together. They somehow reminded her of her days as a repressed schoolgirl, in style if not in colour because her school uniform had been a blue skirt, blue shirt, and black tie. She made a makeshift tie out of a sash of black fabric -- perhaps a belt at one time -- and she even found a pair of white almost knee high socks and black clogs to complete it. She wasn't quite sure if anyone would get it, but at the very least it made her feel nostalgic for dressing up.
Well, not the ribbon-tied pigtails, but those were just part of the costume, even if they made Betsy feel a bit silly.
She made sure to wave to anyone who had encouraged her to come to the party, and even though she'd been there at the mansion for months and months now, she still felt like there were so many people there she didn't even know, and she tried to smile welcomingly at anyone who caught her eye.
Betsy wasn't the smoothest when it came to making friends, she never had been, but she wanted to get to know some more of the people here, since this was likely, hopefully, who she'd be spending the next few years with. If they all made it.