I was trying to describe a list of objects from a more generic point of view to a more specific one. While at the generic level I feel quite sure, using for example.
There are two pens in the dress' pocket.
When trying to be more specific describing those pens I feel like I'm missing something (probably grammar). I would say something like:
One is red and the other is blue.
Is that correct/natural? Are there other (better) ways to express the same concept?