Need app help- customer purchases

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Hello-  I have a dilemma and hoping I can find an app to help resolve this.   I am going to add a clothing collection for Mom & Me clothes.  Basically, these are matching outfits for a mom and her daughter.  However, you can't order one item without the other.  Meaning, you can't order a women's dress and not a girl's item or vice versa.   Is there an app or a way that will force this option for my customers when they want to purchase something in this collection?  I have a note in the description that says that you must get two items, but we know people don't read descriptions 

Please help!


Thank you!