I'm Sunil, from jafferkhanpet, chennai. Quite a post you got here, i do believe it would be better to mention if the designs should be of patterns or a single art set or both. The no of designs you seek, because it's for lungis, a single design itself can be used to make 3 patterns least with colour variations.
Said that it's perennial requirements, how many finalized designs the company requires over what period of time.
Feel free to communicate further details.