Why this collage?
Iske jawab ke liye pic thoda dhyan se dekhna padega :P Yes, black color jeans in all the photos. 

From Last 15 months, I am wearing similar black jeans daily.  This style is inspired by Mark Zuckerberg. 

Is there any advantage of doing this? 

Yes. Now my all t-shirt/shirt match with my jeans so no waste of time to decide combination. Also for purchasing new t-shirt/shirt, I don’t have to think twice. 

Lekin log kya kahenge ki same jeans daily?

Logo ko pata hi nahi chelaga.. :P 1 saal se mere office mein logo ko pata nahi chala.. mere batane ke baad unhone observe kiya. 

PS: I have 3 black similar jeans