I'm not usually one to go for clashing colours or prints but I'm starting to enjoy being able to mix up patterns here and there! Here I kept it simple with pinstriped culottes, and a more out-there, statement t-shirt.
I would say that pinstripes are quite a failsafe way of mixing prints as they're so minimal, and not too 'out-there', so for print mixing newbies, I would definitely try mixing pinstripes with other prints such as gingham, bolder stripes, and spots.
For more adventurous print-mixers out there, try mixing 60s-eque prints, or 90s-esque prints such as florals and checks. To help tie in a mix of prints, pick out items that have complementary colours or the same colour for a more monochromatic look.