I don't think it's cruel for a dog to wear a practical jacket, jumper, t-shirt depending on the dog.
I do think it's cruel to put items of clothing on a dog that are restricting and impractical.
My 2 have winter coats - it stops them getting wet through in the rain.

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A dog Possesses Beauty without Vanity,Strength without Insolence, Courage without Ferocity, And all the Virtues of Man without his Vices.