Bit of a long shot, but worth an ask!
My DD who is a tall 10 year old was wearing a sport T-shirt yesterday. She really liked the sleeves and asked if she could have some regular T-shirts with the same sleeve - the problem is I am not sure what I am looking for! The sleeves were slim fitting on her arm, but not at all tight, and they were longer than a usually tshirt sleeves - May 2/3 of the way to her elbow.
Can anyone point me in the right direction, please?