So my daughter cannot bring her hankies as they are.
So I tried several ideas and introduce you one of them, easy add on pocket.
It's easy to make and useful.
Here is what you need to make a pocket.
This picture shows the process briefly.
Let's start with pictures. Here are what I prepareed for a pocket. The smallert pieces are cotton tapes.
Fold cotton tapes in two and sew them on the top of the outer fabric.
Then, layer two fabric pieces right sides inside and sew the top and bottom edges leaving an opening at the bottom.
Refold it like the picture below and sew both sides, the upper edge of the picture and the lower edge.
Turn it out from the opening.
And sew around the upper edge. You finished make a pocket!
It'll be reversible.
I put one on my daughter's dress what she puts when she goes to school.
I'm happy if you like this idea and it helps your daughter!