It could be for various reasons, maybe to fulfill some kind of fantasy or add an element of surprise.
Often in such manga, the mom wearing a school uniform is a way to create a contrast or add an unconventional twist. It might be used to explore unusual or taboo themes.
The reason could be related to the author's creative imagination or to attract a specific audience. It might be intended to shock or generate interest through unconventional character portrayals.
If you want the clearest chapter reference, go to Chapter 10. Early on, Qiao's shocked face struggle to recover, Lin Manru also tasted for the...; later, the chapter leans on Jiang Li nodded with a smile, seemingly approving of Lin Manru's words and....
If you want the clearest chapter reference, go to Chapter 26. Early on, Shen Lan was bent over processing a large stack of press briefs on her...; later, the chapter leans on She was nearly forty years old, but because she took good care of herself....
The best chapter pointer here is Chapter 28, "Beaten Up Again". It opens with The next evening, Jiang Yan drove home seething with rage. and closes on Lili then kicked his knee hard..
A practical answer is Chapter 45, because it turns the idea into a concrete scene. The chapter opens with Helplessly, Jiang Yan had no choice but to step on the accelerator., adds pressure through Not one of these three ladies is easy to deal with!], and ends on The guests have to go through so.
The best chapter pointer here is Chapter 2, "What Kind of In-laws Are They?". It opens with On the top floor of the Financial Building, a gathering of dark clouds... and closes on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....
Look to Chapter 2 for the clearest answer. It begins with On the top floor of the Financial Building, a gathering of dark clouds..., keeps building through How dare Jiang Li hang up his phone?, and lands on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....
If you want the clearest chapter reference, go to Chapter 60. Early on, What's with Jiang Yan, treating his own sister Jiang Li like this?" "He...; later, the chapter leans on When Jiang Li found a place to live, she didn't bother with him either,....
Chapter 43 is the strongest chapter-level answer because it starts from The moment He Yun willingly sat next to Jiang Li and even took off his... and follows through on Just as she turned her gaze away, the other party huffed and withdrew her....
The best chapter pointer here is Chapter 4, "She Can Actually Tell Fortunes?!". It opens with Qiao regretted her words as soon as they left her mouth. and closes on A little girl acting mysterious, learning fortune-telling, what is this....