unity – COMBINING 2 OBJECTS TO GIVE YOU ANOTHER ONE MORE ELABORATED

I’m looking for some help to someone throw me a light in this problem I’m having.
We’re making a clothing game where you got to grab a “cloth” and a “string” and bringing them to the sewing table to give you one sort of garment.
We’ve already made a list of items but not sure of how to combine them, what you get in return or even how to detect which one is the one you have grabbed.

Thank you in advance.