after-add-to-cart-tag.php

function show_content_after_add_to_cart() {
            global $post;
            $product_id = $post->ID; 
            $tags = get_the_terms( $product_id, 'product_tag' );
            
            if( empty( $tags ) ) {
                return;
            }

            foreach( $tags as $tag ) {
                if( 'shirts' == $tag->slug ) {
                    echo "<img src='safe_checkout.png' >";
                }
            }
}