Education of SubWife

I have lived in US for the past thirteen years, and I think I have adapted well. But every now and then certain facts/things/cultural info come to my attention that are completely new to me; the info that anyone natural born knows, but no book ever mentions because, like I said, everyone is supposed to know this before they stop wearing diapers. Maybe they give out this info in labor rooms, but unless someone tells you, you won't know or deduce it.

Today was one of those days when I found out something new. What is this pearl of American fashion wisdom (or maybe universal fashion wisdom, I am just no aware)? That pink and red don't match, and to be more precise they clash. And according to my American born and raised friend, with whom I had an honor to go kids' clothes shopping, this piece of fashion truth (?) is very common knowledge. Well, they didn't teach that in ESL classes, high school or college. It wasn't on my citizenship exam. Quite frankly, I was shocked, and my friend was shocked in return that I didn't know. In any case, tt would've never occurred to me on my own! I am quite sure I didn't dress DD or myself this way because I am not a big fan of pink and like red even less, so at least I didn't traumatize my little fashionista that way. But if no one had ever told me, it was only a matter of time until my child would commit this fashion faux pas because of her mother's ignorance. Basically, I was a ticking fashion bomb.

So thank G-d for my American friend who detonated this bomb in time. But I still don't know if it's just me, the poor uneducated in fashion foreigner, or someone else didn't know this either. Is this an American mishugas or a universally held standard of beauty? Your feedback would be very much appreciated.

P.S. I am pretty sure that DD has a pink and red striped sweater from Children's Place. What's up with that? You can wear pink and red in one piece, but a skirt/shirt combo with those same colors is a no-no? Am I being too logical about this? Someone please educated me!