Grandmother wants to choose the going home outfit.

So apparently it's been tradition in my husbands family for his grandmother to pick out the going home outfits for her grandchildren and great grandchildren, every outfit I've seen those kids in, are ugly AF!! I really don't want her picking out the kids outfit, this is MY first baby and her 8th grandchild. How do I say no to her? I REALLY don't want her picking it out. I want my grandmother to pick it out.