Hey,
Commercial Art is the art of creative services,referring to art created for commercial purposes,mainly referring to advertising.Commercial Art uses a variety of platforms like apps,televisions,magazines for viewers with the intent of promoting sale of the products,services and ideas.Some of the colleges that offer this course are:Jamia Millia Islamia, University of Mumbai,Seamedu Mumbai,Big Art Institute Mumbai etcetera.
Garment Technology is the discipline where you learn about the different technical aspects of the production of garments. It is offered in Government Institute of Garment Technology,Amritsar and Dr.Dharmambal Government Polytechnic for women,Chennai
Hope this helps.
Good luck.