WooCommerce: Add Product Cateogry class to body on single Product page

functions.php

/**
 * Add Product Cateogry class to body on single Product page
 * Author: MarioMarkovic.com
 */
add_filter( 'body_class', 'wc_product_cats_css_body_class' );
function wc_product_cats_css_body_class( $classes ){
    if ( is_singular( 'product' ) ) {
        $current_product = wc_get_product();
        $custom_terms = get_the_terms( $current_product->get_id(), 'product_cat' );
        if ( $custom_terms ) {
            foreach ( $custom_terms as $custom_term ) {
                $classes[] = 'product_cat_' . $custom_term->slug;
            }
        }
    }
    return $classes;
}