If you search for "model's bag," there are several good links that offer advice from a model's perspective. I share a similar list with clients and hope that it's helpful to you:
Basics
Skin and make up
- Oil blotting sheets
- Q-tips
- Tweezers
- Make up brushes
- Concealer
- Powder
- Foam wedges
- Mascara
- Lip balm
- Lip gloss
- Lip color palette
- Eye shadow palette
- Moisturizer
- Eye drops
- Tissues
- Make up remover
- Razor
Hair
- Brush
- Bobby pins
- Hair ties and bands
- Accessories
Clothes
- Undergarments in nude, black and white
- Heels
- Sandals
- Casual shoes
- Socks
- Strapless or tube top
- Hosiery in nude, black and white
- Basic black dress and skirt
- Basic white top
Miscellaneous
- Phone and charger
- Contact information and directions
- Mirror
- Toothbrush
- Floss
- Clear deodorant
- Personal care items and medications
- Mints
- Band aids
- Sewing kit
- Lint remover
- Music player
- Pen
- Payment or voucher
- Comp card or portfolio
- Shot list
- Petty cash
- Ibuprofen
- Water bottle
Beyond the basics
- Robe
- False eyelashes and applicator tool
- Small, plastic palette
- Necklaces
- Earrings
- Glasses
- Scarfs
- Hosiery
- Distinctive clothes (maybe vintage, ethnic or atypical in style or material)
- Hats
- Double-sided tape
Before shooting, don't...
- Wear tight clothes - that leave marks on your skin.
- Use sunscreen - which will clump when combined with powder.
- Apply foundation - without asking about make up.
- Use harsh astringents or scrub your face - leaving red, blotchy skin.
- Forget about your nails - ask or use clear polish.
Guys can use a subset of this list with simple substitutes for basic t-shirts, dress shirts, tank tops, jeans and slacks.
I'm definitely an over-packer, but I'd rather have something I don't need than need something I don't have. I hope this is useful!