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Well that explains these pants then:

You needed an explanation for Tintin’s pants?
No, seriously, pants like these were very popular in the nineteen teens and twenties. They were economical for growing boys because they didn’t need to be let down or replaced as their legs got longer. When Hergé first drew Tintin in these pants, he was just dressing him like a typical boy in his mid-teens. Time and boys’ fashions moved on, but Tintin kept those pants until the nineteen-seventies. He had one adventure in jeans and that was the end of him. There’s a moral here somewhere!

ARE THOSE THE PANTS THAT JEEVES WOULDN’T LET BERTIE WEAR