These are the most common scenes my friends and I are asked to do (most popular first):
Secretary
Schoolgirl
Maid
Prisoner
Girl next door (don't really need an outfit)
Little girl/teenager/babysitter/big sister/etc.
Superhero (Catwoman most popular)
Spy
50's housewife/pin-up model
In my basic kit, I always include (in addition to your list) a leash, a medium flogger, clothespins, gag, a baby crop, vibrator or two, plug or two, beginner cuffs, maybe soft rope, blindfold, vet wrap (good for just about anything from blindfold to gag to bondage) and my hygiene/safety kit (protection, lube, gloves, baby wipes, hand sanitizer, mouthwash, safety shears, basic first aid). All in a lightweight rolling suitcase or cute duffel bag.
And of course, my kit is adjusted based on what my partner desires and what the scene calls for. I always err on the side of too many toys versus too few. Just in case I'm extra bad and need all the toys used on me!
Hope this helps