The plugin YITH Product Size Charts for WooCommerce allows you to create and assign custom Size Charts to products in your store.
Create size charts
Size Charts are created and changed within the custom post-type Size Charts.
To create a new Size Chart, just click on Add Size Chart and you’ll see a screen like the one below:
The plugin gives you the possibility to create size charts with unlimited rows and columns. You can create rows and columns by using plus buttons and delete them with minus buttons.
Assign a size chart to a product
To associate the size chart to a product, you can select that product from Chart Options.