Kids and their bits
Ds1went through a phase of constantly pulling at his diddle. Like every 10 seconds. It lasted about 8 mths. Ds too is doing it now but he does it about once a min so it feels not so embarrassing.
I have had girls in my kindy class at themselves and the teachers ask that the parents dress them in trousers/leggings- u can pop a skirt over the top. It does seem to be worse with umm easy access.
Sorry no advise

Sorry if it doesn't make sense, the barefoot princess is covering me with kisses