Yikes! How do you find a bathing suit?

I'm looking for a swim dress for my holidays. There are some online on www.swimwear365.co.uk/womens/swimsuits/swim-dresses/_/N-19Z1z141vjZ1z141vb I think I might order one or two to see what they are like. I've looked in M&S and didn't like anything they had.

Decathlon? Thinking along the lines of a wet suit

If you google swimsuits with legs quite a few companies do them.
One company I saw with a nice one was called
Simply Swim

Maternity bathers?

David Emmanuel designs are sold on QVC.

How about a burkini? M&S sell them.

Debenhams have excellent 'longer leg' swimsuits-wide straps,but sleeveless i think,but a gym top or something could be worn under it maybe?

I need a new swimming costume with a firm control panel on the tummy and proper straps that won't slip down. As I get older I cover up more. I usually wear a wrap over swim suit unless actually in the water. The confidence of youth long gone. I used to like Bon Marche but I'm not keen on any of the swim suits in the summer collection. Since Emanuel gone I am not keen on dresses any more. I wish he would go back and design for them again as he had a knack of covering the wobbly bits and somehow making my body appear smoother.

Burkini?
It does have its good points, anybody can be “beach body ready”

Try looking at Tankinis, looks like a swimsuit but in two pieces. There is another long discussion with lots of suggestions.