Pop up a checkout to encourage customer to review order

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Hi - I am looking for pop up that shows up at check out to advise my customers to check their order before proceeding to make sure they have selected the correct fit and size. I offer tees in a couple of different fits to accomodate a wider variety of customer.   It would also be great if the pop up included a check box to confirm that they read and understand the statement because I want to advise that returns for incorrect fit selection will not be accepted to prompt them to reach out to help sizing help before ordering.