When I first started I bought the white jacket and hood combo suit and gloves. Here in FL, most of the times you are working with the bees, it is 90 degrees plus with 90% humidity. Even with just a veil on, it is way to hot. I bought an ultra breeze type jacket from Mann Lake but i have only used it a few times, mostly for training classes and usually end up taking it off half way thorough the lesson. Most of the time I just wear jean pants and a T shirt. I used to worry about dark clothing but other than black, I wear what ever color I feel like wearing that day. Lighter colored shirts are cooler.
In class, like Iddee, I always tell my students to wear what ever it takes to bee comfortable with your bees.
If you wear heavy leather cloves, you will kill a lot of bees, even if you are trying to bee careful. You do not normally feel them and you end up crushing them. When this happens, they leave pheromone scent on your gloves and the bees get aggravated when you put your hands back in the hive. If you have to wear gloves, wear the blue vinyl gloves, you can feel the bees before you crush them and it keeps them calmer.