I do the same with basic tshirts / underwear for laundry cycles.For me, I buy basics in multiple colours and enough of the neutrals so I don't run out before the next laundry cycle. (e.g. black camis, white turtlenecks, black leggings)
Otherwise, I tend to buy similar/same silhouettes once I've found one that complements my body well. My wardrobe is filled with a-line dresses/skirts and high waisted bottoms, for example. I'm very much a maximalist so I have a wide range of colours and prints.
And silhouettes are in fact whats most important in finding your style and outfits that work for you! That´s what people notice and remember