There are no child clothes in her size, well THERE MIGHT BE but they're designed to have the opposite effect.
I think that there is still a wide gap between a child's taste and a well-dressed adult's taste. For one, the whole outfit feels way too complex (and style over functionality) for something a child would want to wear. I know it's intentional, but I still think that there should be some immersion-breaking event to emphasize that she's 10.
Yeah she looks dazzling to the point anyone would take her for an adult... BUT there are 2 things to consider, if you check early chapters, she's wearing very hmmm "childish" simple clothing, a shirt with shorts and that red backpack most of the times. However, this time around she has a coat and gloves with a scarf...why? simply because is very cold in winter lol Tae as well, she's in full armor.
If Mai hasn't already stolen your heart, Ch26 Pg16 would do anyone in.
Bro....she's only at least eleven. Maybe twelve.
11 as of chapter 9.
Ch9 mentions a change in seasons and Ch8 was the summer camp event, so Mai's birthday is at the start of fall, quite a ways away from Christmas/New Year's. She'll be 11 for a while yet.
WELP! This confirms that Mai chan does not know "exactly what she is doing" as many readers theorized, in fact, as far as she knew, they were just being friends, from now on, she'll start thinking about what love really means.
It's a little bad for Tae san too because I think she also wanted to believe that Mai chan was actively seducing her with everything that entails.