Midwest2- well said! Wearing a colored shirt is not a sign of “going off the derech” or either is wearing a different type of jacket, hat or yalmuka. They have just chosen a different derech but as I learned in school a long time ago- when moshiach comes all of bnei yisrael will sit in a circle, none closer than the rest, around the shechina and state “this is my Hashem”. No matter how they look, or what shul they go to, they are all part of “the servants of Hashem”.
White shirts are not kavodik at all if they are sloppy, messy, dirty or in need of a very good pressing. If i had to say what was more kavodik, a messy white shirt or a clean and neat blue shirt, I’d pick the blue one in a second! Yidden need to look presentable and neat as the rest of the world looks at them. “Look at those slobs… those yeshiva bochurim look disgustingly dirty- have they showered in the last month?” and yes- I have heard people comment about frum people’s looks. From the frum to the frei to goyim, yes they do look and they do care.