The problem with most slim fit knitwear is that the people making it have confused slim with small. You end up with something that pulls across the shoulders, rides up at the waist, and makes you look like you borrowed it from a younger sibling. That is not what we are after here. A slim fit jumper should follow the body without fighting it. Clean through the chest and arms, enough length to stay tucked or untucked depending on the day, and a collar that sits well whether you have anything underneath or not. We have been specifically looking at pieces where the proportions were clearly worked out on an actual person rather than a fit model who has never eaten a meal. Merino and fine wool blends are where most of the best options live. They drape rather than cling and they layer without adding bulk. These are the slim fits that earn the description.