Our secondary is just introducing stupid blazers. The HT said they had to wear them all the time and if they wanted to remove them in the heat, they'd have to ask permission and the teacher would decide whether they could
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So I wrote to the HT and said that my children needed to remove their blazer they would. Yes, they might ask but if they are ever refused, I said I'd be fuming. A teacher cannot tell hw warm another person is and at work, staff do not have to ask permission to remove items of clothing due to changes in temperature. The armed forces don't even have 'summer dress' anymore.
I actually hate blazers, not because they don't look smart (I'm sure they do) but because when you're wanting kids to get on and do work, they really don't need an uncomfortable, polyester blazer getting in the way. I'd have thought that for science, they'd have to remove them.
I was cross that a blazer means in winter you have to buy another coat to go over the blazer. Another expense!