What temperature should I consider when deciding to don a jacket? As the seasons change, and the crisp air begins to permeate our daily lives, how does one accurately gauge the appropriateness of outerwear? Is it merely a matter of degrees, or does one take into account factors such as humidity and wind chill? Should I rely solely on the weather forecast or trust my personal comfort level? Perhaps the activities planned for the day play a pivotal role in this decision. For instance, will I be outdoors for an extended period, or do I intend to remain indoors, enjoying the warmth of a cozy environment? Moreover, how does individual physiology contribute to this conundrum? Are there specific thresholds for different people based on their tolerance to cold? In essence, at what precise temperature does it become prudent to wear a jacket to maintain both comfort and style? Can guidance be discerned from fashion trends alongside practical considerations?