A false waistcoat is such a handy little item! Just pin or sew into the shoulders of your jacket. Single brass button opening. Can be raised or lowered to suit the height of your jacket neckline. Just unbutton and leave in the jacket for next time.
Great for those hot days, or those kids that grow too quick.....OR ..Maybe you just don't have that much room under your jacket!
I can make up to your colour requirements if desired.