Bottom suit button to hide medical problems?

Because I have a medical problem, I think that suit jackets look much better on me with the bottom button closed? Is this OK?

I had a serious illness and had surgery. My small intestine now exits through my abdomen. I wear an ostomy pouch to the right of my belly button – this causes a small bulge. I also have a parastomal hernia around the ostomy – and it causes a much larger bulge. It’s a bulge about the size of half a large grapefruit to the right and a bit lower than my belly button. So my abdomen is uneven – it bulges on the right side.

I’ve been shopping for suits and no matter what size I try on, the jacket front will never lie flat. With only one button done, the skirt of the jacket flares open and shows the bottom of my shirt. I am trying fuller, classic cut suits, not trim fit. I find this quite distracting that my shirt shows below the top button – I think it looks sloppy. I feel that when a jacket is buttoned and I’m standing in relaxed position, the jacket should cover the lower part of the shirt. If I button the lowest button, the front of the suit covers my shirt nicely.

Many clothing sales people act as though I’m committing some terrible fashion crime by closing the bottom button, although they are unable to offer any other solution to fit a suit to my hernia bulge.

I have found that wearing a waistcoat and leaving the jacket unbuttoned looks pretty good. I don’t want to always have to wear a waist coat and I would like to be able to button the jacket and have it look reasonably neat?

What should I do?