Can you give any more details on what the shirt looks like? I have several shirts that might fit the bill but I don't know what the difference between RCAF and army summer dress shirts would have been.
I would describe the shirt as a light olive green, cotton shirt. It has an attached collar. The official description is "shirt, airman, khaki drill, cotton". You can see colour of the shirt at the link below.
Ya... that still doesn't help much. Like I wrote earlier, I have a few shirts that will look the part but might not be actual RCAF issue. The army used a similar shirt and since most of my shirts don't have much in the way of markings anymore I have no idea if they are actually army or RCAF. That being said, if you want one I'm sure we can come to an agreement. Send me a PM if you are interested.