Tailored to Be a Bad First Impression
When meeting your SO’s parents for the first time, you want to make a good impression. One way to do it is to put on appropriate clothing. Get rid of those earrings, your mohawk, and torn black leather jacket, and put on something nice for once.
The OP was asked to wear a white t-shirt and blue jacket, but it just so happened that’s the exact same outfit the dad wore when they first met. We think the GF was trying to sabotage their first meeting, but the fact that another guy at the restaurant they were eating at wore the same attire as them was just a lucky coincidence.