Bolt waterproof Over Trouser For Bike Rider, Outdoor, walking Touring Fishing Rain safety Over pants 

Waterproof Over Trouser for Motorbike Riders, Outdoor Walking Touring Rain Safety Pants
Elasticated Waist
Half Side Zip & Wide Opening Ankle Cuff
Double Taped Seams
Made Big to Fit Over Motorcycle Pants
Buy Your Size Not Bigger
Sizes: S, M, L, XL, 2XL, 4XL, 6XL (size chart is given)

The trouser is made big it is designed to go over your regular motorbike pants so please buy your right size and it will work.
Size chart is attached but note the waist and cuff measurement is STRETCHED OPEN Maximum measurement for all around the trouser not just half & its all in cm.