Jason Collins' Twin Brother -- Gets Straight to the Point

Telling apart newly out and proud NBA player Jason Collins from his identical twin brother Jarron Collins just got a whole lot easier.

Jason and Jarron were spotted leaving "Jimmy Kimmel Live" in Hollywood on Wednesday looking pretty similar as usual, except for one thing ... Jarron wore a shirt that highlighted a major difference between them.

As a joke, Kimmel gave Jarron the "I'm the Straight One" t-shirt during his interview on the TV show last night ... not that there's anything wrong with that.