I finally found the plugin to speed up weighting. It transfers weights from your base mesh onto the added parts so you can make clothes fit better.
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I'm working on a tutorial but here's the link bowlroll.net/file/375
---Set Up Plugin---
Step 1. Download the plugin from this link - http://bowlroll.net/file/375
Step 2. Unzip the files into your plugin folder...for example on my computer it's "PMDEditor_0139(english)\_plugin\User". It will be the "User" folder inside the "plugin" folder in your version