You can run the Apparel Add-on both with ProductCart Standard version and ProductCart Configurator. An example of the Configurator system used with the Apparel Add-on is a customizable “gift basket” in which one of the selectable items requires further definition (e.g. one of the items that you can put in the gift basket might be a print for which you need to decide whether you want the frame or un-framed type, with golden or brown trim).
Please note that the Configurable Product itself cannot also be designated as an Apparel Product... but one of the Items assigned to the Configurable Product can be.
Currently, if you are running ProductCart Configurator with the Configurator+ Add-on, and you add the Apparel Add-on, you will have to apply an additional set of files after you have installed the Apparel Add-on. These are files that are shared by both Add-ons. If you don’t upload these files to your store, the product configuration pages will not work properly. You can request these files from ProductCart or your ProductCart reseller.
Beginning with v5.2 which is scheduled to be released in Q2 2015, you will not need to request the additional files as everything will be consolidated into a single file set.