mw13 is 100% correct.
Who makes chumros? Not Yankel Shoemacher. Chumros are set by Chazal, the Rishonim, the Achronim, the Gedolim! Who are we midgets to second guess these great men?
We are specifically told to make gedorim.
(The white shirt thing has nothing to do with this issue. It is simply a uniform for Bnei Torah, as Yidden are supposed to have a uniform.)