How can I add a 'product type' choice for my customers?

[XXShushiesXX]

I have a store where I sell products with my designs on them. However, I've run into the problem where I have a HUGE amount of products all with the same design on them, it's become messy and disorganized and as much as I try to organize everything I fear that I may be missing out on the opportunity of showing my customers what else they can get with the same design. 

What I specifically need is a drop down option for my customers to choose between shirts/hoodies/sweaters etc. I get my POD done by Printful (if that helps). Is there an app I can use to make this happen?

Thank you