Victorian themed wedding... guests need Victorian themed clothes

[LiesDoNotBecomeUs]

I'm not sure if this is the right place (I might be 150 years too late for this style advice).

I'm invited to a September wedding with a Victorian theme. (The family celebrating are Victorian society members in a city with proud Victorian-heritage.)

I need a 'Victorian-ish' outfit for the occasion but am mature, apple-shaped (tall -but size 16 and mostly belly).

I can improvise for children's book day events and things like that but this is a serious adult occasion - in a church - and my sewing skills are poor to appalling. (I'm known for messy injuries with sissors and stitching my -several years in the making- apron to my own skirt.)

Worst of all, I've a horrible idea that Victorian-ish means tight waist (I've never seen mine) and ballooning skirts.

I'm going to look like an appropriately themed traditional boiled pudding aren't I?

Can anyone help on how I can go about this? What style could pass for Victorian and not get me placed on the desserts table with custard?
(I've even considered arriving as a ghost.)

Victorian covers a huge range of styles - late 1830s to 1901. The 'look' that really suits larger women is the 1850s to 60s crinoline era, as the large skirt makes the waist look smaller and creates the illusion of an hourglass figure. A good corset, laced comfortably and not tightly, will make any dress look better and fit properly. Hire a local dressmaker with good reviews - even better if they make costumes - and get them to make something that will fit you beautifully. The mainstream sewing pattern companies Simplicity and Butterick do some very good Victorian costume patterns that a good dressmaker could use.

Something like these?
Check out Pinterest for ideas then see what you can find online