Once upon a time, there was a crow chilling on a tree branch. He looked below and saw a black pig and said out loud:

HAHA! Look at this pig, he looks dirty.

The pig looked around and finally realized it was an equally black crow who was poking fun at him. He responds:

Oh, it’s just a pathetic filthy little crow.

The crow became offended and shouts:

Who are you calling filthy? Have you taken a look at yourself?

The pig clapped back:

Have you?!

After a string of arguing back and forth. They walked over to the nearest pond to see determine who was the lesser attractive animal. They stared at their reflection, looked at each other in detail and remained silent for a while. Then the crow happily spoke up and said:

There’s nothing wrong with having a dark coat!

The pig happily agreed:

Yeah I think black is a good look!

Moral of the idiom: Don’t judge someone else before taking a good look at yourself. Additionally, just because someone has similar traits to you, does not also mean it’s a good thing.