clothes for teenagers (Upperthorpe S6)

I work at a special school (secondary) and am looking for spare clothes for our class spare clothes box.
Sometimes the kids get wet playing and need a change of clothes. Or they don't come in clothes suitable for the weather.
Especially looking for
- joggers in different sizes
- XL size t-shirts
- gloves
- sweatshirts/ fleeces in different sizes, especially XL
ideally plain, comfy and suitable for school.