If the school specifically states that your child needs to have plimsols for gym, you need to look for ones that have adjustable Velcro straps on the front of the show. (thefashionablehousewife.com)
Avoid plimsols unless they are Converse as they tend to look more preppy than street. (theidleman.com)
Accessorise with a shoulder bag, sunglasses and cute plimsols. (outfittrends.com)