Apps for selling combined products

New Member
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Hello, I want to venture into selling t-shirts for a group. 

I want to sell couple t-shirts on my website. How do I combine two different products in one sale option?
For example: Selling t-shirts for a family of 4 or selling similar t-shirts for husband and wife together or selling t-shirts to a group of 7 friends

Which app will help me the most in achieving this objective? Please provide me with a suitable answer. I am stuck here.

Thank you for your help.