wc-display-product-attribute-archive-links.php

/**
 * Display product attribute archive links.
 */
function wb_wc_show_attribute_links() {
	global $post;
	$attribute_names = array( 'pa_color', 'pa_size' ); // Add attribute names here and remember to add the pa_ prefix to the attribute name.

	foreach ( $attribute_names as $attribute_name ) {
		$taxonomy = get_taxonomy( $attribute_name );

		if ( $taxonomy && ! is_wp_error( $taxonomy ) ) {
			$terms       = wp_get_post_terms( $post->ID, $attribute_name );
			$terms_array = array();

			if ( ! empty( $terms ) ) {
				foreach ( $terms as $term ) {
					$archive_link = get_term_link( $term->slug, $attribute_name );
					$full_line    = '<a href="' . $archive_link . '">' . $term->name . '</a>';
					array_push( $terms_array, $full_line );
				}
				echo $taxonomy->labels->name . ' ' . implode( $terms_array, ', ' );
			}
		}
	}
}
add_action( 'woocommerce_product_meta_end', 'wb_wc_show_attribute_links' );
// if you'd like to show it on archive page, replace "woocommerce_product_meta_end" with "woocommerce_shop_loop_item_title".