Highly upset

I would like to know what law or rule is it that if my kids have takkies a t, shirt and a pajama pants they are not allowed In to game store at trade route mall because this unfortunate event happened to me on Saturday 26 September 2020 at 11:15am where the security prevented me from entering the store because my kids had on pants that were pajama pants never has this happened to me before at any other store so When did this rule come about I am disgusted and offended by game trade route mall