You're not entitled to anything, you changed your mind, there's nothing wrong with the uniforms. The key word here is 'local'. Boutiques, local shops and one-off shops generally do not do goodwill refunds, they can't absorb the losses. Regardless of whether or not it's actually there, the contract was made and they're on their way, it's the same thing really. Take the credit note, ask for a long-lasting one, you will need more uniforms, or even just tracksuits or shirts for PE. Or you could sell it in the local paper?