There is the following anecdote: The shoes from Europe were slippery with a smooth sole, and for this, getting a hint from straw sandals in Japan, he made the sole grooved to make it not slippery.
裏がつるつるで滑りやすかった南蛮渡来のくつの裏に日本のわらじからヒントを得て滑り止めの溝を彫らせ滑りにくくしたという挿話もある。