Look For A Freeware Or Shareware To Design Clothes - Optitex ?

Hi,

I'm designer and draw and make dress and uniform. Do you know a freeware or shareware to help me in my work to create on computer clothes or show the design to my customer? I heard about optitex design fashion. Someone used it? How to download it or where to buy? How i can learn to use it? Is there is a school to learn it in Bangkok or somewhere else ?

Thanks u very much )