My son is very rigid about his clothes, not accepting any new item. once he has decided to wear gray color pant, means no other color he will wear, this is since 3 years. we need to purchase same color clothes in 5 to 7 quantities. what is the problem to accept new things? why he is behaving like this? he will cry for hours if we forcefully make him wear something which he dont want is. plz suggest me for the same