First off, the traditional dress. While you won't have to dress like the henro from Shinnen's Shikoku Henro Michi Shirube to be outfitted correctly, a henro should wear the following:
There will be 5 lines of kanji written on the hat: "dogyo ninin" will be one line, then four others that make up a poem, of sorts. In addition there will be one solitary sanskrit character, the character for Kōbō Daishi. When you wear the hat, always wear it with this one sanskrit character facing forward.
The walking stick represents Kōbō Daishi so you must take good care of it. When you stop for the night, whether at an inn or not, the first thing you do is wash the bottom of the stick (symbolizing washing the Daishi's feet). After doing that you can take care of yourself. The walking stick should be kept in the tokonoma (if there is one) of your room overnight. The kongō tsue also symbolizes a henro's gravestone as it would traditionally have been placed at the head of the grave if he died and was buried along the trail.
One other note about the walking stick. It is tradition not to let the walking stick touch the ground whenever you are crossing a bridge. This tradition comes from the fact that Kōbō Daishi was forced to sleep under a bridge one night (see information for Bangai Temple 8) because he couldn't find lodging anywhere else. The Daishi's spirit still sleeps under bridges along the trail, as the story goes, and while crossing those bridges your walking stick will make a lot of noise and disturb him - if you let it touch the ground. On bridges, hold the kongō tsue off the ground.
I'm still using the same bag i bought back in '99 when i knew nothing about the henro and i have always called it a fudabasami. Looking at a catalog as i type this, though, i see that what i have is a zutabukuro. It's a smaller white cotton bag (half the size of what Tom has in the picture above), with the long neck strap but no internal pockets or compartments, and with velcro holding a flap closed over the top so nothing falls out. On the front of that flap are the words Dōgyō Ninin and the Sanskrit character (bonji or shushi) associated with Kōbō Daishi. I prefer my zutabukuro because it is noticably smaller than the typical fudabasami — just big enough for my nōkyōchō, the map book, candles, incense, osamefuda, and whatever candy i receive as settai from time to time. There is no extra room, and yes, stuff does get crumpled, broken, etc. from time to time.
Of course, there are other items that a completely outfitted henro can carry, but anything in addition to what is listed above seems to be extra. These "extra" could include: a buddhist rosary (juzu or nenju) for use at the temples (Some people carry it wrapped around one of their wrists throughout the day); tekō, cotton covers worn over the back of the hands; kyahan, cotton gaiters to cover your ankles and the top of your boots; and even possibly jikatabi, white, cotton socks with a pocket for each toe, worn when you also wear waraji, straw sandals, instead of boots.
Let me stress, though, that you don't need to carry or wear any of the above to be a henro. What i have listed above is simply what has come down through history as the traditional dress. A i mentioned on the previous page, one of the nice things about this pilgrimage is that there is nothing that is considered right or wrong. Anything you wear can be considered more or less traditional, but not wrong. I wore a light colored hat, but not the henro hat. In 1999 i didn't carry the fuda-basami as i kept everything in my back pack, although starting in 2004 i did carry one. In 1999 i didn't wear a bell on my belt, but i did starting in 2005. When i was on the trail i saw several henro in non-traditional garb, including some in blue jeans.
Just to offer my opinion, let me say that i think all henro (yes, i mean ALL) should carry a walking stick and wear the white hakui, even if you wear no other henro related clothing. These two items single you out and let everyone know that you are walking the henro trail. Whether you believe me or not, this will affect your pilgrimage as just by having these two items, people will interact with you in a much different manner than if you don't have them. They're fairly cheap — buy them. You won't regret it.