Aunt Petunia wasn't, eating anything at all. Dudley didn't even protest at the food (cottage cheese and grated celery). It wasn't altogether surprising, therefore, that Dudley kept running his hand nervously over his backside, and walking sideways from room to room, so as not to present the same target to the enemy. Dudley had emerged from his last encounter with a fully grown wizard with a curly pig's tail poking out of the seat of his trousers, and Aunt Petunia and Uncle Vernon had had to pay for its removal at a private hospital in London.
This was not because the diet was at last taking effect, but due to fright. Dudley, on the other hand, looked somehow diminished. To some people, this might have looked like a gesture of welcome, but Harry knew it was because Uncle Vernon wanted to look impressive and intimidating. Harry wasn't bothered about what the neighbors would think, but he was anxious about how rude the Dursleys might be to the Weasleys if they turned up looking like their worst idea of wizards. Weasley usually wore long robes in varying states of shabbiness. Weasley wearing anything that the Dursleys would call "normal." Their children might don Muggle clothing during the holidays, but Mr. They'd better have the decency to put on normal clothes, that's all." "I've seen the sort of stuff your lot wear. "I hope you told them to dress properly, these people," he snarled at once.