It would be convenient to talk with the photographer or contact person to know first what are they expecting from the pictures, based on that you ca you have a wide variety of things to choose.
Anyways, when I get my photo this is always what I carry:
* 2 posing suits (choose the ones that favour you)
I usually try to get different colours from the usual ones other girls have, in order
to stand out. In this case, I get the black just as a back up.
* 2-3 fitness suits
As the ones you use for the gym, but bring the sexiest ones. If I'm too lean and
want to appear bigger I try to avoid dark colours.
* shoes
As shoes take a lot of space in the bag, I only get two pairs (tenis and high heels)
Regarding makeup, try to get your makeup done before the shoots, and you can use body shimmers (I think this is how you call them) for making your skin shine without making it seem oily.
As you mention they will be at a studio, they'll probably have lights so just remember to keep almost the same tone of makeup as in stage so that your face doesnt look washed out.
For hair, if you're doing splits, handstands, etc. for photo shoots it is better to have it styled so as not getting all your hair in the face. If you'll be just posing then you have more options. Sometimes with all time rushing I just do a pony tail and put a hair clip (don't know if this is how you call them) they are those of fake hair that are already styled and are like hair extensions... of course similar to my hair tone.
Hope this helps
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