There was a loose thread on her school uniform

Unknowingly to Akari, there was a loose thread on her school uniform. The thread must’ve somehow appeared when she was getting dressed for school earlier this morning.

During this morning, Akari woke up a little bit late, so she kind of had to rush it and get dressed quick. She made sure she didn’t missed any clothes, but apparently, she didn’t noticed the thread earlier this morning.

Even in class right now, Akari still doesn’t notice it, because she’s so focused on what the teacher is saying in class. But the question is, where is the loose thread at on her school uniform? And will any of her friends notice?