I agree with Lou! get a hat/scarf/bandana/hoody
I am the worst for using straighteners but at rallies/bike hols there's just no room for them, and people don't give a hoot anyway, but if you're adamant you can't do without them, i suggest some gas straighteners.
Although I haven't really done much more than 4 or 5 days on bikes hols, I've found the main things i need are:
toothbrush/toothpaste
wipes
deodorant
hand towel
comb
mascara,
lippy
few t-shirts
2 pair of jeans (one on under my leathers )
1 fleece
undies/socks
pair of croc type shoes or other soft shoes.
Thats about it really, apart from the obvious, money/cash card, keys
You will be surprised how little you need, of course if you're going to be away for longer you might need a few more clothes, or find a launderette or take some handwash and wash your clothes whenever you can.
It depends if you're camping or staying in hotels/B&B etc, but personally i have found, I take less each time I go away.