Warmcore is an aesthetic that is related to Cottagecore, Naturecore and other nature/farm-related aesthetics. The aesthetic related to things at make a person feel warm and fuzzy inside, with a hint of nostalgia. Warmcore aesthetics usually warm, bright lighting over a usually nature centered aesthetic. Its nostalgic quality can come from visuals just blurred or warm enough to feel slightly like happy memories.
Warmcore fashion consists of flowy dresses, floral prints, blouses, comfy and, obviously, warm clothes. Summery outfits fit into this aesthetic as well. A lot of the fashion inspiration is similar to Cottagecore and Grandparentcore.