Your a moron for such believes and this is just pure emotional hamster wheel rationalisation to make yourself feel better, it's the type of things women do, you were turned down because your game was lacking on that day, something that happens to all of us.
But you can only learn from such mistakes once your honest to yourself first which requires taking responsibility, this is why in general most women don't learn from their mistakes because of their inability to reign in those hamster wheel emotions and deluded rationalisations.
Your mistake like we all once made is that you turned up to the date with a subservient mindset to try to impress her which automatically places you at an abject inferior loosing position from the very get go! you lost this before you even turned up to the date and your deluded to think it's because of a t-shirt.
Talking of t-shirts, a decade ago I turned up with a black Tshirt that had large visible drool stains on it which I slept in the night before, I didn't even bother changing it because I was running late already, it made no differences whatsoever to what transpired.
In life your either dictate or your dictated to and whomever dictates the interaction ultimately is the superior one that makes all the decisions that you will be forced to accept as you have right now.
The only reason you are asking for the experience of other people in similar predicaments is an attempt to make yourself feel good about what transpired, this is not how your learn from mistakes, it's what women do.