To manufacture something, is to make or construct it, usually for industry and sale. Unless you make all your own clothes, a company probably had to manufacture them.
Manufacture is generally associated with industry and factories. Henry Ford, for instance, revolutionized industry by using assembly lines to manufacture Model Ts. But manufacture can also be used for the natural word, like bees that manufacture honey. Occasionally it use used more generally to mean to construct by putting parts together. And in a pinch, you can manufacture — or make — the truth, which is a creative way to say “lie.”