I ever went to MBM and fitted into 2 gowns. both bustier..actually most of us think Bustier dun look good on us, but we may be wrong, cos with all the'fishbones" corsets, you'll be surpised how "straighten up" we can look. I was told the more "fishbone", the better. With the right lgth of veil, it can cover up our flaws at arm areas, as for evening, just let down our hair to use as cover ups. i think it should look ok.
I tried Halter, it wasn't nice on me. In fact, my only OD gown i chose that was a halter, but I am going to have it altered to be a bustier. This can be done.
I am just hoping for the best now. no choice then will hv to take pills to reduce weight...yet, so scare that once stop, weight bounced back double! this was what happened to me many years ago! Sigh..
CSY, You can try shops or departmental stores like robinsons, etc.. some of them carry big size clothes and they can be used for ROM too. Maybe outside Tailors can help you do tailoring if you really cant find any and if BS do not have time for your MTM.