what do you mean by bass fishing clothes? how are you catching bass? from a boat? from the bank? in a float tube?
just wear what ever is comfortable, in Summer I like to wear a pair of board shorts and long sleeve shirt. I like long sleeves shirts because you can roll the sleeves up if you want to and can roll them down if it gets cooler or you want a bit of extra sun protection. I always wear a colored shirt to keep the sun off the back of my neck. If you fishing from a boat you seldom get wet (except maybe launching the boat) so I wear a pair of board shorts under a pair of long pants. wear the board shorts for launching and then just slip the longs on when we start fishing.
A couple items of clothing I always carry with me is a very light weight rain jacket ( this coupled with the long sleeve shirt will keep you surprisingly warm if need be, because those jackets do well to block the wind), a pair of old white socks ( the deck of a lot of boats can get pretty hot in the sun especially the hatch clamps) the socks also help to keep my very white feet from getting burnt to a crisp, and of course a buff (buffs double up a beanie a balaclava or even a scarf), don't forget a hat, I prefer a peak but do keep a spare floppy farmers hat in my bag for if the peak gets blown off or if the sun is extra harsh. if the weather is going to be on the cooler side I also pack a thermal long sleeve vest (light weight jacket and long sleeve top coupled with this gives you three layers and you should be snug for any weather except very cold conditions, you will know before hand if its going to be very cold on the water then pack a heavy jacket)
as for dedicated "bass Clothing" I don't think we get that here in SA, the US will have brands dedicated to bass fishing but they just normal clothing with a different brand name.
Just a question of dressing for how you going to fish.