VAT deals with intra-state trade and CST deals with inter-state trade. VAT is a form of indirect tax imposed only on goods sold within a particular state, which essentially means that the buyer and the seller need to be in the same state
2) since you are selling garments interstate CST would be leviable
3) Sec.6 (1) of CST Act provides that every dealer shall be liable to pay tax under this Act on all sale of goods (other than electrical energy) effected by him in the course of inter-state trade. Goods here include all materials/articles/ commodities and other kinds of moveable property.
4) since you are selling goods to customers across india CST would be levied
