That’s totally up to you – you just need to bring along things that you love that you’d like to see your baby photographed in.  If you’re having more than one family member in the pictures, it’s a great idea to coordinate – even if its just in colour or tone (you don’t need to twin, though you’re welcome to).   I have some outfits at the studio (think pettiskirts and rompers for girls, and nappy covers and knitted trousers for boys) that you’re welcome to borrow and some people like to have photos of their little ones wearing nothing but a smile.  It really is about whatever works for you.   There’s always time for outfit changes if you want to.