Nice philosophy Marco, but unfortunately totally unrealistic. Can you name me any British clothes brands that are actually made in Britain? How far do we take this, we don't grow cotton in this country and I expect the cotton pickers are paid the going rate for cotton pickers in whatever country they work. We as consumers can't be held responsible for the working conditions or rate of pay that these people have.
Maybe one suggestion would be to for clothes shops have something similar to the supermarkets have like a 'fairtrade' label. We could then have the option of buying with our conscience rather than our wallet.