Fetching details from the dictionary...

to put on (lower-body clothing, e.g. pants, skirt, footwear); to wear
to affix (a sword to one's hip)
武士は刀を帯いていた。
The samurai wore a sword.
甲冑を身に帯いて戦場に出た。
He donned armor and went to the battlefield.
昔の武士は常に刀を帯いて外を歩いていたそうだ。
I hear samurai in the old days always walked outside wearing swords.