All the girls in my family have a long "wingspan" like that.
Mum adds to the sleeves of her things with a sewing machine, often turns out really good looking.
She also makes her own sweaters sometimes.
Most of my sisters do the same, but one of 'em is just the sort of person who doesn't need to, because she's just that lucky with clothes shopping. (You know the type. Can walk into a random shop off the street, dip her hand in the "10 dollar" pile and pull out something that's beautiful, stylish, still "in", and fits her like it was made for her.)