[Plugin: WooCommerce] Woocommerce taxonomy product

Ok, so I’m trying to make a custom widget on a product page, and I can get the widget to show up however when I add code like

<?php if ( in_category( 'Shirts' )) { ?>
&bull; Shirts
<?php } ?>

The category is not read or printed on the widget. I have tried every possible Taxonomy in place of “in_category” like product_cat, in_product_category, and many others. The selected category is in the product categories. What am I doing wrong?
I’ve done hours of searching, and nothing works. Help is very much appreciated! Thanks in Advance!