18 oz jeans

At the request of a customer, we have tested an extra heavy denim, whether it can be produced by us?
normally we use a 14oz denim (400gr / m²); this test is an 18oz (610gr / m²) these pants weigh +/- 1 kg.
Breaking these pants, wearing them and taking over your body movements is hard work ...
Another test to possibly include in our range in the future. A Japanese 18 oz denim, these pants easily weigh 1 kg and with a bit of luck will stay straight standing on theirselfs.