Sleeve length had me and the lady in country wide pulling our hair out.
Living in a horsey area, she was forever getting teen girls in wanting waterproof jackets. Kids sleeves, finished at teens elbows, even if they were skinny enough to get the jacket on and adult sleeves were way too long.
However, my real nightmare was getting tops for DD1 between 9 and 12. She was rather plump. Kids stuff was too tight, but adult stuff was all cut for boobs, at the time mostly very low. Without boobs it was positively indecent.
Fortunately she then shot up, slimed out and developed curves and now can buy clothes quite easily.
DD2 being so much slighter, will be able to stay in children's tops until she is adult shaped which makes life so much easier.
The choice of non pink and childish older girls tops is still not great. They do jump from Hello Kitty, to sculls and goth crucifixes both of which I hate.