AITA?

My step daughter is only with us 20% of the time . Maybe 30% when we have her for 2 week stretches over summer . Yesterday I got work clothes that I ordered online and my husband was questioning what I got for his daughter . Well I didn’t get her anything . I got her a couple things already for when she goes back to school . I don’t think that buying her everything is my responsibility. I should also add that he occasionally sends her to her moms with more items . And lots of family also takes her shopping so there is nothing that she lacks . We have a daughter who I provide the majority of things for . For whatever reason, I feel like people assume that because we are married my daughter need’s absolutely nothing . While I make sure my daughter is taken care of , I feel like that’s unfair . Just because my step daughters mom & dad aren’t together they spoil her with so many materialistic things . What they do is none of my business but I think it’s rude that they expect me to spoil her too . Again I get her things when needed or on occasions , or simply because I feel like it but to give her everything she wants is not in my itinerary as I don’t spoil my bio daughter like that either