1. YOur difficulty is that you did not get properly legally advised before you went into business. Essentially, each school uniform will have design rights attaching to it and there will be copyright and possibly other issues relating to the logo. Accordingly, you should essentially have sought a licence from each school to produce their school uniform. It was not sufficient to assume a licence merely because they did not respond to an email. At this stage you will have to enter into negotiations for a licence to sell the school uniform and to licence the logos. Otherwise you can be injuncted for selling the uniforms. You may also find that no shop will stock your uniforms if the school gets wind that you are selling them somewhere. Additionally damages will be payable by you for selling the school uniforms without a licence.
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2. If parties rely upon their rights, then a licence will issue or some agreement will be reached as to the providing of uniforms. You don't seem to realise that where there are legal rights involved, parties can rely upon them. Accordingly, it is within the legal right of each school to restrict who provides their school uniforms, if the uniforms have been designed by someone and if there is a logo to which copyright attaches. I note that you have an agreement with one school. This is fine. You can sell that school's uniforms. However, I am merely advising you as a matter of law that you can be prevented from selling school uniforms by any school which does not agree to it. Whether you once sent them an email requesting a right to sell them makes not one blind bit of difference. You cannot of your own wish just ignore the law.
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3. Copyright is an unregistered right. There is no need to register it in order for copyright to exist. Accordingly all of those school uniforms with a logo have copyright attaching to them. So, the reality is that you can be sued if you sell them and you will have to pay damages to the school or whoever owns the copyright in the logo. So the bottom line is that you cannot sell them without incurring further legal liability. You really should have obtained legal advice before you expended money in manufacturing the school uniforms. Now you are caught in a bind, with product manufactured but which you are unable to sell. In future when someone does not reply to you, do not presume that they have agreed to your course of action.
4. Your principal option is to sell the uniforms abroad where English copyright does not run and where the identity of the seller may not be known. However, I would advise you not to make any more uniforms. Before you sell any more uniforms, get the consent of the schools or get a copyright licence. In future when you are intending selling school uniforms get the consent of the schools in advance. Don't merely send an email. Go and meet the people concerned and get their consent.
5. This is perfectly legal practice. Essentially, this is a licence fee arrangement which is perfectly lawful, I regret to say.