Grey school trousers age 2-3 (Parkside SK7)

Hi my 3 year old has just started in nursery at school and wears uniform, I was given 4 pairs of grey trousers which fit him great as they have an adjustable waist my only issue is I can't wash and dry them fast enough. I've tried to buy more but the super markets don't sell that size any more and my boy is tiny (but mighty) but if anyone has any school trousers In 2-3 that you no longer need I'd be so grateful and can collect.

Thanks.