Since it is not a cheap 'throwaway' garment, I'd spend a little time on it. Undo the seams at neck and hem at the centre for about 3cm, then cut the lining top to bottom in the centre, sew in a full length strip of fabric, about 6cm wide and allowing a small seam allowance top and bottom (might have to hand sew the second side since it will be inside the garment, or unpick the hem more to get access) Then fold the fabric in a box pleat to the outside and restitch the neck and hem seams. The fold in the lining should give a bit of ease across the back and it won't rip or catch your arms when you put it on. If you can't match the lining colour, use a strip of something patterned, make it a bit 'glam' When the pleat is pressed, it will look like a deliberate design feature. (even if only you can see it!)
It really shouldn't take very long - says the one who forgot to put ease in her last lining and had to do just this.