Everyone will have their own ideas, but here is my packing list.
I walked the Camino in September of 2006 and again in 2009.
On my body I wore:
Hat - I had a Tilly hat, but anything to keep sun out of your eyes
1 pair zip-off legged pants
1 short sleeved quick-dry shirt
1 pair underwear
Wool Socks with liner
New Balance Shoes
Money Belt (cash, ATM card, Passport, tickets)
This is what I carried in my backpack:
Marmot Pounder Plus sleeping bag
1 pair silk longjohns
1 pair zip-off legged pants
1 short sleeve quick-dry shirt
1 pair underpants
1 cotton long-sleeved shirt for sun
1 long sleeved fleece shirt
1 tightly felted wool sweater
1 pair wool socks
1 pair sock liners
1 pair Tevas tied to outside of backpack ( for showering and walking after hours)
1 toothbrush and travel-sized paste
1/4 bar shampoo/bathsoap (Liggets)
1/2 bar Naptha clotheswashing soap (buy in Spain)
1 microfiber dishtowel (for baths)
1 1-litre water bottle (filled it up at fountains)
1
ALTUS poncho
In a fanny pack I carried:
tiny camera
pen/tiny journal
cash for the day
Pilgrim's Passport
Earplugs