My uniform is similar to the second uniform pictured above.
It is med. weight GtMA/Tiger Claw brand uniform ... the corduroy material is similar to that of Adidas Champion uniforms but it doesn't cost as much.
I've had this uniform for almost a year now and it still has retained its crispness & color.
I do have a spare lightweight uniform for the warmer months although I do prefer the *snap* of a heavier fabric.
I see now that GTMA is offering a sleeveless dobok for the summer ....
http://www.kungfu4less.com/sl.html