Next Level Men's Triblend Crew L VINTAGE BLACK

Vintage white, Heather white and white all look exactly the same in their pictures. Can someone please explain the difference between them?

Is vintage Royal just a heathered Royal or does it have black thread mixed in with the blue thread?

Does this order include more than one t-shirt?

I bought the small, which is good on my chest / shoulders, but it's not long enough, rides up. My waist is about 30". What do you recommend, please?