Whether you like skinny, boot-cut or flared - wearing your favourite pair of jeans could mean helping the environment, as well as looking good!
Designer Helen Storey from Catalytic Clothing has created a special powder for your laundry.
It contains something called titanium oxide that sticks to your clothes when used in the wash.
The chemical then helps destroy pollution in the air - while you wear your clothes out and about!
Watch Leah's report for more.