What is the meaning of "strips thin but very delicate" in the following precisely-quoted passage?
"My grandson Vin come at weekends and he likes to sun himself in the garden. He strips thin but very delicate, and a lovely choice of the trunks. Gold and white satin." — p.57, Anglo-Saxon Attitudes, 1956, Angus Wilson.
The quotation is part of Mrs. Salad's explanation to Gerald Middleton about living at the residence of her daughter, Gladys. Mrs. Salad is Middleton's former char-lady, and is visiting him two days before Christmas, for exchange of gifts.