It could be for a special costume change or to add a unique visual element.
Maybe it's part of a new story arc where the red belt has some symbolic or functional purpose. It might be related to a particular mission or to show a change in Batman's style or equipment.
The red belt in Batman comics could be a designer's choice to make him stand out or it might have been incorporated to represent a new phase in his character development.
Chapter 331, "Zhu Shun and Huang Tianxi, Cold Yuan Banquet of Great Xia Year 3, Xia Yuzong (6)", is the clearest early answer because it turns Xia Yuzong's situation into a concrete plot event. The chapter gives readers a real answer by opening on Xia Hong suddenly let out a hearty laugh and raised his glass to... and ending on Wah..." Over a hundred people, all at Cold Resistance Level,.... In story terms, the chapter closes with It's not only Xia Yuzong's birth;
Chapter 308, "Shocking Turn, Grave Injuries, and Restless Hearts", is the clearest early answer because it turns Hou Xing's situation into a concrete plot event. The setup is Five people emerged from the crowd., but the pressure keeps building through Their appearance was unremarkable, wearing the iconic white attire of....
Chapter 323, "Approaching Labor, the Talented Xiao Family Assembles Urgently", is the clearest early answer because it turns Xiao Kangcheng's situation into a concrete plot event. Early on, How many advanced Cold Beasts are there at the Beehive, capable of.... By the end, Usually, they just join hunts for low-level Cold Beasts..
Chapter 309, "Gamblers at the End of the Road, Li Family's Swan Song", is the clearest early answer because it turns Meng Ying's situation into a concrete plot event. The setup is As daylight arrived, the biting cold light spread over the earth, and..., but the pressure keeps building through The more than one hundred thousand people in the garrison all quickly....
Chapter 317, "Wrapping Up the Migration, Great Xia's Flourishing Scene, Star-picking Hall", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. The setup is Second Year of Great Xia, September 30, First Half of the Night..., but the pressure keeps building through From the northern city wall of Xia City, a slight rumble suddenly....
Chapter 293, "The Lion Hunts the Rabbit—Luring and Falling into the Trap", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Second Year of Great Xia, July 1st. and ending on Unfortunately, Li Xuanling hasn't invested deeply enough, sending a.... In story terms, the chapter exposes hidden motives around Xia Chuan, so readers can finally see how the conspiracy layer of the plot is actually moving.
Chapter 304, "The Defeated Longyou Army, Xia Army Cannot Escape, Holy Tripod", is the clearest early answer because Dewdrop Plague gets a payoff that changes the stakes. The chapter turns that into something concrete by moving from Xia Chuan realized this point earlier than the others, so as soon as... to Following the leader to achieve such fortune, I've lived enough.. What makes it stick is that the chapter closes with "Tend to yourself first;
Chapter 279, "Refocusing, Expanding Territory, and the Disappearing Army", is the clearest early answer because it turns Demon Sheep's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Xia Hong originally thought that the greatest significance of... and follows through with As long as there is a good start, there will always be a day of....
Chapter 263, "Strategizing, An Elder Brother Is Like a Father", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing Xia Hong's inquiry, Xiao Ning's face turned red at once. and ending on Currently in Great Xia, only Xia Hong as the leader is qualified to....
Chapter 304, "The Defeated Longyou Army, Xia Army Cannot Escape, Holy Tripod", is the clearest early answer because Cold Resistance Level gets a payoff that changes the stakes. Early on, As the two armies distanced themselves, the underground main zone.... By the end, How are the soldiers' conditions?" Just earlier, after the Teng Jiao....