I've bought a character at the content store but found out that it has no icloth properties. 
I would like to add a lab coat to the character. What would be the workflow of adding custom coats to an object without icloth. 

This is the character I bought:
https://www.reallusion.com/ContentStore/ccdproduct.html?contentid=AIC600CIENU012020150930005

Hope you can help me out.