Hi,
Years back, we used to send used pants to Calcutta where we get them back as saree bags

. And yes, Saree bags and Blouse Bags are very useful to keep it in the ironed form. I use a saree bag to keep my kurtas too

. It is available in all bag shops in and around NSC Bose Road, Sowacarpet. Infact, it is a part of the wedding torsseau there!
Cheers
Arch