It’s simply appalling to see what we have come to. Go back 30, 40 years ago and no one would have thought to make impose such mishugas upon any bochur. Instructing him to buy specific brands of shirts, fancy davening jacket, only white shirts etc. It used to be that a bochur would learn in Yeshiva. No peer pressure for him to put on the pretty clothing from neither the rebbeim or other buchrim). So what if your shirt was blue?! Does that means you can’t learn Torah?! That you’re a apikores?! Chas V’Shalom!
Listen, wear something mentlich and you’ll be fine. I’ll go against what i just said and say wear the white shirt so as not to get yourself kicked out of Yeshiva. (Which is completely ridiculous if you think about it. I can get kicked out of Yeshiva for wearing a blue shirt!) But don’t for a second think that this is what defines you. Be it your watch or your tie, the color of your shirt or the brand, none of that defines who you are. You are no less of a Tzaddik then any other yid. Don’t let anyone tell you otherwise. You have a Yiddisheh Neshama and are going to learn in Yeshiva. Nothing else!
Honestly the yeshiva world has a lot to answer for. Perhaps some of you would like to enlighten me?