Hello Linda M. Welcome to the forum.
My job is altering and repairing clothes and I've been doing it for over 35 years.
Righty ho then.....Lovely outfit.
Well done for getting a second one for cutting up. I'd be chuffed to bits to have all that extra fabric to play with.
Without seeing exactly how it's all put together...I'd say that it ought? to be possible to enlarge it. It's certainly the type of job I've done before.
I do a lot of alterations for a lady and probably 90% of them involve me putting pieces in the sides...She's always delighted with them.
It it all in one, or is it a skirt and overdress? Does the collar sit/fit OK? Collar could be a bit more tricky to adjust wider...
It's probably going to be a 'Big Job'
So expect it to cost accordingly.
Sandra.
xxx