I love keeping a small idea book full of sketches that I later will end up using in my concept sketches. It's nice to have a small sketch book that can fit in your hand bag but there have been times I scribbled on any old thing just to remember the idea until I got home. :)
Here are a few Costume/Fashion sketches that I love:
Fashion Sketch by Kat Macleod:

Costume Design by Deborah L. Scott for the film 'Titanic':


Costume Design by Jacqueline Durran for the film 'Atonement':
Some of my favorite Art supplies:
-Pencils: Derwent and Prismacolor
-Watercolors: nothing special, bought at Trago Mills in Falmouth, UK
-Watercolors: nothing special, bought at Trago Mills in Falmouth, UK
-Rubber kneaded eraser (these are the best!)
-Pencil Sharpener
-Pencil Case made by Genevieve of Pretty Wit
My stack of sketchbooks:

From top to bottom:
-Spiral bound sketchbook (not sure where it's from, reject of Matt Parker photography I love being at the Parker house when they clean out their closets!)
-Hardbound square Sketchbook by Winsor and Newton (bought in Truro, England)
-Moleskine softcover notebook. (the thin ones that come in a 3-pack)
-Leather Bound Sketchbook from Barnes and Noble
Want to turn your scribbles and ideas into art? Check out this amazing book:

Are you inspired yet? :)