It would also be cumbersome if you always had to pull over to consult your maps.
The shoulders of your blouse should line up with your shoulders and it should not pull over the bust.
Cover ups such as a sarong or pull over will not only look stylish but will provide extra coverage.
The top should be a simple pull-over with either thick straps or a racerback style.
What if you pull over your cover-up, and then you take your tankini top with it?