Clasic Pants for men Fundoshi
Since you can wash at home, we recomend such synthetic silk fabric one.
Under Kimono must fit the Kimono (not your body as well), so please let me know the Kimono wing size as well as your height (centimeters). Also your Kimono’s seasonality.
We can see under Kimono from your sleeves so professional can know you dress in right under wear.