Can underwear randomly stretch 2 sizes bigger?

So uh... I was putting on my underwear for the day after my shower and the pair I tried on FELL OFF ME. I was like wtf and checked the size and it was right. I compared it to all my other pairs of the same brand and that shit was HUGE, like 2 whole sizes bigger. In all dimensions. It didn't seem broken or stretched, it looked straight up like an XL pair of normal underwear.. Can that happen? Like in the wash or something?

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