Originally Posted by Tomasso
I've just one word for you kid, Fresco. Incidentally , I just noticed a length, in navy, for sale on the buy/sell.
What a coincidence!
But it is a great choice for a summer cloth. Very breathable, yet doesn't appear overly informal.
Another good choice would be a mohair blend - as mohair is stronger it can be woven in a much lighter fabric, it can stretch up to 30% and regain its shape, and hence it resists wrinkles very well.
As for construction you might try a half or even quarter lined jacket where either just the sides and top of the back or just the top of the back and part of the sides are covered in lining fabric. A tailor actually asked me "why would you ever want a less than full lined suit?" Avoid anyone who asks such a stupid question. Oxxford do many of their lighter weight suits with a quarter lining. http://www.oxxfordclothes.com/make06.asp