If the product is something you sew, like a suit, you must use the verb 'tailor'. You can use the verb 'tailor' or perhaps better, 'customize' for other products that are designed by you. For example: We customize T-shirts for each client. or use it as an adjective: We make custom T-shirts. Note,

Almost correct. It should "We could tailor our products....." Drop the -ed after "tailor" .

We could tailor our products for each of our clients.