I'm pretty sure there is similar thread somewhere in the archives, but I don't remembers this being asked during my time on the forum.

Do you have duplicates in the wardrobe, whether exact same item (style and color) or in different colors?

What makes you reach for the same item in the shop?

I'll start.
I have two dresses, red and purple; red one was bought first and at the end of the season the purple one reappeared in the stock, on sale, and knowing what workhorse the read one had been, I haven't thought much about buying the second one. (There's now a blue one too, but I've hid credit card from myself )
Some layering tees with 3/4 sleeves proved to be clever buys - all in different colors. They are of good quality, I actually never thought I'd become picky about tees, and definitely worth the money.

Over to you.