Many special interest groups want to place conditions on trade agreements environmentalists, human rights advocates, labor unions, etc. All have admirable goals, but the practical effect is that the more conditions required, the less likely an agreement can be negotiated. It's also true that people will pay more for a product if they have a reason. Organic produce is an example. Sales are small but growing.
People pay more because they perceive organic to be worth more.
Some people may pay more for apparel if they know it is not made in a sweat shop. I have tried to convince my family to buy only products made in the United States. I have never bought a foreign car. A friend who is an unquestioning liberal and a social activist buys imported clothes because they are cheaper. She drives a foreign car.