Sky shot up as her face flushed bright red remembering she was walking around in front of three men in Arlo's sweatshirt.
Arlo had picked her a winter pajamas. She doesn't like full pant and full sleeve shirt hence she randomly pulled his sweatshirt which would be of the same length as her T-shirt dress excluding size and wide neck which made her one-shoulder expose.
She was scared when the trio entered and she didn't care about the dress that time then she was taking revenge followed by dinner. It was completely out of her mind that she was wearing Arlo's sweatshirt, not the T-shirt dress.
Arlo knew whatever went on in her head. He didn't ask her to change because she wasn't looking awkward and nobody could see her curves as his sweatshirt was loose to her.