Helena had received an invite, though she didn't know the person who the party was being thrown for. She didn't really know anyone here, except for Harry and Fred and the few others that she had run into contact with. But Fred had invited her, and she genuinely enjoyed his company. Besides, it would have been a good time to try out her new trousers.
Rather then borrowing Angelina's, she had opted to get her own pair, a pair that fit her just right. Still, she was terribly uncomfortable and wasn't sure how she was supposed to walk correctly in the tan pants. The shirt had been purchased off of a rack in the store, just a gray frock that flowed away from her stomach and showed off her arms from the cap down. Everything about this outfit was off, and she wasn't sure she could get used to it and get comfortable.
Still, it was important to try, and if worse came to worse, she could have always went back to her Bungalow to change. When she entered the backyard, she stopped to fidget with the waist of the trousers before anyone took notice of her. Ravenclaws did not fidget!