I've been buying the exact same pair of boxers for years. This year I noticed that they were actually smaller, by almost an inch. Elastic band is smaller and the actual length, so it started chafing. Shrinkflation even on clothes.
When Levi’s moved to Mexico it wasn’t that the sizes got smaller, it was that they got inconsistent. Before I started shopping around for more responsible brands, I enjoyed the privilege of being able to walk into a department store and simply buy jeans based on the label. No dressing room. After I had three pairs of the same sized jeans that varied from uncomfortable to comfortable. Tolerances matter.