i know basically nothing about modding, i'm just wondering how you might theoretically go about implementing custom sprites (and portraits i suppose) that depend on which season it is so you could have npcs wear like. shorts in summer or a heavy coat in winter i havent done much digging to check if this is a thing already so if this is a stupid question let me know any info at all would be much appreciated
This can be done with Content Patcher's seasonal conditions. See Tanpoponoko's Seasonal Outfit Changes for a work in progress.