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// Remove each style one by one
add_filter( 'woocommerce_enqueue_styles', 'jk_dequeue_styles' );
function jk_dequeue_styles( $enqueue_styles ) {
  unset( $enqueue_styles['woocommerce-general'] );  // Remove the gloss
  unset( $enqueue_styles['woocommerce-layout'] );   // Remove the layout
  unset( $enqueue_styles['woocommerce-smallscreen'] );  // Remove the smallscreen optimisation
  return $enqueue_styles;
}

// Or just remove them all in one line
add_filter( 'woocommerce_enqueue_styles', '__return_false' );