I wear these jeans
says they're $40 but they go on sale quite a bit in store and online and you can often find them for about $25. Doesn't have to be AE. Boot cut jeans just look good. IMO.
As for Shirt. This is very broad. Depending on what you're in to the most and what you like. I normally just go with a pair of those jeans and a T-shirt. Usually a Nike Dri-fit, Royals shirt. Plus its different because I live in Kansas and you live in California and our climates are much different so obviously styling choices are different but I'll put down a few things and if you like where I'm going ill post more. Pretty much Bro-wear.
Can't go wrong with the Dri-fit. So comfortable and loose, no matter the weight.
I like shopping at Kohls because you can always find something on their many many clearance racks and they carry my Cargo Shorts that I love. Which is another thing. Check out Sonoma Cargo shorts at Kohls. Very comfortable and cheap and they look good.
Also Old navy has some nice clothes that won't break your bank either.
Button up plaids are in right now, and so is layering.
I could also spend a whole paycheck at Dicks