daweeka.....Whoa. Cat urine, Oh boy. If you are talking about just a few articles of clothing that can be easily & cheaply enough replaced, my suggestion would be to simply trash the urine-soaked clothes. Obviously, you'll need to deal with the issue so you are able to prevent this problem from recurring. There's very little that is as offensive as the odor of cat urine. This is due to specific enzymes. It requires specific ( Unique, if you will) products to completely rid an item or area that has been sprayed with cat urine. The product must contain the specific enzyme that counteracts~~removes~~dissipates the cat urine enzyme. In other words, it's the "battle of the enzymes."
You can TRY anything and everything known to man....but to make this odor disappear, the specific product I mention is required. An online search will bring up several companies that make this product.
I know of one called "Zero Odor" from a company near Atlanta Ga. If you have difficulty finding this product, try googling this. It's been years since I used this product but I can guarantee it WORKS!!