A mesorah can change over time…..one metric of that change is how a large segment of the Tzibur evolves in their observance, as informed by their own rebbeim and poskim. This is not the exclusive form of change, and we could have a one-time edict from all gadoyley yisroel that a change in mesorah is required. However, the inyan of ervah/tzinius with respect to a sheitel vs. snood vs. tichel etc. is materially different from debating whether our mesorah includes eating chicken A versus chicken B.
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