I will present a plausible biyur about yeshivish men wearing white shirts –
B’hekdem, a kasha, why is this minhag not applicable to yeshivish women? In other words, if there is some maalah in wearing a white (such as “simplicity” or “purity” etc), wouldn’t this maalah apply also to women?!
Therefore, one MUST say that the maalah of white is a maalah EXCLUSIVE to males!
Now we know that a halachic beged (clothing discussed in Torah) are associated with a positive and negative mitzva: Tzitsis and Shatnez. Although shatnes applies equally to male and female, tzitsis is a levush ish exclusively (to the point that Targum Yonoson on issur of Lo Yilbash gives an example of the issur for a woman to wear male clothes: to wear teffilin or tzitsis!).
Tzitisis are described as LOVON and Tcheles. Today, we no longer have the tcheles according to major poskim. We only have the LOVON.
As such, when a male chooses a beged elyon to wear, it is appropriate that he choose one that is LOVON – hence the WHITE shirt for men (exclusively).
(Those who ear blue shirts must ask themselves how they hold about tcheles…)
And that is chidush and lomdo. Thank you for allowing me to be marbitz it.
P.S. I am not c”v disparaging anyone who wears other color shirts but sharing an insight to the maalah of LOVON for a beged.