Adding an attribute that's just a paragraph for customers to type in?

Yes, you can do that by creating an attribute (Settings -> E-Commerce -> Product Attributes), and then choosing 'paragraph' for the 'Attribute Type'. Here's a video to give you even more details!

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People like to use the Paragraph Attribute as a Comments section. To make the Comment section as wide as your order page, set your Order Page Width & Output Page Width to 1o5.