How do I add custom tabs on product pages?

I would like to add a custom tab such as size chart beside the Description on product pages. I have not found an add-on for this. Thank you in advance.
You could fill in the atributes and this would give a new tab.It will give a strong tekst.
Edit includes/templates/*.catalog/views/ LiteCart emulates Bootstrap 3 Tabs so you can easily find a how to guide.
Thank you tim. I would like that only the products in certain categories (dresses) have the custom tabs. Is there any way to solve it?
I have an add-on that lets you use a custom template view for a certain product. When you edit the product you can set the view e.g. "pages/product2". Would that do?