The shirt had the gaz flap but it was sewn flat by the owner probably in order to have his chest and neck open for more ventilation. The cut is exactely like the Pink Windpoof Airborne set.I had another shirt with cuffs shortened and pen pockets added, unfortunately I sold it for a friend few months ago.
I have been collecting Vietnam camouflage uniforms for 25 years and your heavy weight Invisible Erdl pattern set is fantastic.
In all these years I have only owned the pants.
You have a super rare killer set there.
The set is cut just like the 1st pattern windproof uniform.
The shirt has a gas flap?
What is the date in your set?
You have something very special there, in my opinion.
all the best