My normal size is 34G, but I ordered a 34G and a 34FF as per the fitting guide to compare the two for the best fit.
The straps are fully detachable at both the front and back, so this can be worn strapless or the straps can be worn as standard or crossed at the back.
Personally, I wouldn't wear it without the straps, as being of a certain age, gravity has taken it's toll and I need straps for support.
They arrived with the straps already crossed, so I worked out the easiest way to put it on, unless you ask somebody to attach the straps afterwards, is to pull it over your head and then put your arms through the straps.
I tried it both with the straps standard and crossed. The straps are quite narrow though and I didn't feel it gave me the support I want and I just felt the cups looked too big.
For info, of the two sizes, if I were to keep either, I would have kept my normal size.
Feedback to Bravissimo - why is size tried/purchased a mandatory field when people might order more than one but not purchase any of them?