how to bundle shoes with customes?

[ruoyucad]

I am selling costumes and some costumes come with shoes but I want to add shoe attributes to the product as well it will contain more than 100 attributes which are not allowed. so I have two options one is to have customers leave me a message regarding the shoe size, the other option is to separate shoes from costumes.  but is there a plug-in in Shopify where I can bundle them together?