Traditional
な adjective
Transmits the feeling of wanting to unite behind something. What do people unite behind, if they're all part of a similar people? Tradition. Add 的 on there and you have traditional.
でんとうてき
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
褌は、伝統的な日本の男性用下着です。
Fundoshi is traditional Japanese underwear for guys.