I've just bought the same long-sleeved t-shirt from Uniqlo in <cough> 6 different colours. It fits beautifully, is soft, warm and comfortable, and is great for when I want a casual, layered look.
However I've realised that my wardrobe also contains two identical cotton dresses (black / pale pink), two identical silk dresses (tomato red / navy blue), two pairs of Uniqlo jersey barrel legs (olive / black), two pairs of identical chino-style jeans (olive / navy), two identical linen dresses (blue / green), three identical cashmere sweaters (black / navy / beige), etc etc
Do you do this too? I can't decide whether this proves I know what suits me, or is just incredibly dull and unimaginative 😂