Some sweaters simply keep you warm, while others make people stop to ask where you bought them. Half-zip knits manage to do both, which is exactly why they’re becoming our favorite alternative to shapeless oversized pullovers. The elevated collar and thoughtful details bring a sophisticated, rich-lady touch to everything from everyday jeans to tailored trousers. Fortunately, achieving the look doesn’t require a designer shopping budget. We found 17 gorgeous half-zip sweaters on Amazon, including intricate cable-knit styles, slimming ribbed designs and chic neutral options that go with practica...