You go to the market to buy yourself a dress. You like two dresses, one of them is pink and the other is blue. Now you come home and you tell a friend of yours about the dresses you liked at the market.
  1. I will buy the blue one.
  2. I will buy the one in blue.
  3. I will buy the one with blue color.
The first one sounds most natural to me. Tell me about all of them. Regards Aamir the Global Citizen.