SJS:
Respectfully disagree. Lifnim Me’shuras Hadin is a higher Madraiga than Din itself. The streimel is not a good example, as YOU have no reason to wear one (if you’re not a chassid) and be “lifnim”. One always can be more Tzanuah by following the “suggestions” of our chachomim (as long as it doesn’t get to the point of Chosid Shoyte), even though they are not required as halacha per say.
Of course, there are trade offs by being more tzanuah (Shalom Bayis, for one (I would be mad if my wife shaved her head)) and a Rav and your husband should always be consulted.