Style risk: work a chunky turtleneck sweater into your outfits. Wear your chunky turtleneck (this really just means a heavier weight turtleneck sweater) with jeans and a casual coat. You should probably not wear your chunky turtleneck with a blazer: you could look like Pierce Brosnan in Remington Steele. Frankly, it's just not a modern look. But chunky turtleneck + jeans + casual coat = winner. And by casual coat we mean a work jacket, chore coat, utility jacket, anything boxy and slightly oversized so you don't render your weighty knit an uncomfortable burden.

Style risk: layer a thin jacket underneath a topcoat. Within reason, layering multiple jackets is a good look. Not 100 coats at the same time. But a middle piece like a shirt jacket or denim jacket can be very smart-looking. It's a way to be playful with your look and introduce a complementary color or texture. It also lets your topcoat (or another roomy coat like rain jacket, parka, or mac-mackintosh jacket if you hate abbreviations) be what it is. Your finishing move.