It's not the consumer demand for chepar prices. It is the corporate demand for larger profit margins. You see, Arrow shirts for example. will cost you $21-30. Labor and materials in the United States, in a once Union dominated industy, could cost at least that much to make in today's market . The same shirts are being manufactured and imported into the United States from China, Malaysia, Vietnam, and low labor cost areas cost only around $2 per shirt. It means the corporations such as Walmart, Penneys, Sears, Macy's and others did two things in regard to clothing. 1.They busted the American Textile Workers industries, and 2. They increased their profit margins considerably.
That $25 shirt you just bought at Macys was made in a Vietnam child labor sweatt shop, imported to the United States, and hung on the rack for less than $3 in cost. That's a pretty good profit margin for these corporations. The poor kid or senior that sewed it probably made about 23 cents per shirt paid by volume piecework. Today, you can thank Walmart - the largest imorter of child labor manufatured goods in third world countries.