You can but there are likely to be rules against wearing them on certain rides or attractions. There is often somewhere to leave shoes and bags etc. at the entrance to the ride and they can be collected afterwards.
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Do not wear flip flops on roller coasters, and be sure all loose articles are secured.
While you may be required to wear certain kinds of protective footwear if participating in any kind of backstage tour, you're good to go with open-toed shoes for a typical day in the parks!
Sneakers or water like sneakers would be the most appropriate. DO NOT wear heels or sandals. I saw a lot of sandals break and feet slipping around in them. Being on your feet all day you really need to be smart for your feet.
It depends on what you find comfortable, flips flops also good on water rides as they dry fast, also I find sneakers, trainers too hot when we are there July/August, . You can wear flip flops but with some of the coasters, it's really not too smart because you take the chance of losing them.
Do Not wear material that you can see through when it gets wet. Find a bra where your ladies are not going to fall out when you're on the coasters, or just walking around for that matter. Or a dress/skirt (I know some that this is all they wear.. wear a garment underneath for modesty.)
The key for any amusement park outfit is COMFORT and LAYERING. The parks open early, so you'll want something warmer in the morning (unless you're going in the dead of summer), easy layers you can shed in the afternoon as it warms up, and layers you can add back on as it cools down at night.
According to Disneyland's website, the rules that visitors must adhere to include: not impersonating Disney characters, not wearing clothing with objectionable language or graphics, and not wearing clothing that exposes excessive portions of the skin that may be viewed as inappropriate in a family environment.
There are a number of items that are not permitted at the Disneyland Resort. Fortunately, deodorant is not on that list. I usually pack a travel-sized deodorant in the backpack I take on our visits.