DS8 -almost outgrown disposable swimpants

[NineteenForever]

DS8, nearly 9- cannot initiate or decide to go to the toilet on his own. Hence permanently in pullups. He is very slim- but at some point in the near future he'll need bigger swim pants. We use the disposable ones, and I know it's not enviro friendly but I really would like to find disposable ones for older kids. Anyone got any ideas?

Not a lot in the way of "bigger" disposable swim pants out there is there. would you consider re-usables. Ones that undo at the sides are easy to get off dirty without a mess. like these
www.incywincy.net/acatalog/Opening_Style_Swim_Nappies2.html

www.lyddawear.com/cat126_l2.php?n=1
Italian company - some odd english, I think its just translation issues. They have re-useable swim pants for all ages

www.dorset-nursing.co.uk/CategoryTemplate.aspx?catID=1437
Have similar looking products and a few more , with less techy info and better english.

google incy wincy - they do a whole range of disability swim gear.