I really love my girlf

But her clothing choices do make her look a little bit ‘frumpy’. She’s pretty short but also has put on lots of weight. She only wears knee length skirts which all fall below the knee because she’s so short. I don’t want to tell her to get them taken up, but any ideas for where to get better fitting clothes (UK.) I work in a clothes shop and nothing we have fits her well. Help!