1970s blouse and the case of the strange button

[LousyLoversVintage]

I have what i think its 70s to 80s blouse. Alamode of california with union tag. Not help in dating just a question about a strange button placement.

I dont know alot about blouses as is

So its a long sleeve with a collar and v neck ....not a button up shirt. Definitely poly blend.

The sleeves are a bit baggy and button at the cuff.
So the question is......
There is a button just behind the left side of the collar but no where to button it to....what is this button for ? No remainders of a loop or hole for it to button to.

What do u think it could be for? Just an extra button? I dont have any photos but if anyone would like to see i can include some once i am home

 

[bycinbyhand]

Hi, can you post a picture?

 

[LousyLoversVintage]

Of course i thought i uploaded some last night. It didnt work.

 

[LousyLoversVintage]

I think these are more clear

 

[Vinclothes]

I can't see a button. Could there have originally been a loop? It could slip out of the edge of of the neck facing without leaving a trace.
Marian

 

[Vinclothes]

I cross-posted with you!. Now I see the button.
Marian

 

[LousyLoversVintage]

Ok so maybe it would have originally buttoned

 

[anothertimevintageapparel]

I agree, an elastic loop to close it.

 

[Vinclothes]

Probably it was a convertible collar. It could be worn open as it is now, or closed with the missing loop, giving 2 different looks.
Marian

 

[LousyLoversVintage]

Great thanks i wonder if i could sew some elastic on to allow use of the button. Ill try

 

[GemGem]

I have seen vintage blouses like this with a button on each side which had an attachment, like a bow, could you see if there is any hint that a button was on the other side? A loose thread or a couple of tiny marks from the sewing of one.