The boutique at CN carries bathing suits for men & women but I would not say there is a large selection. I have never shopped for one there but the boutique is small with lots of other things so from what I recall, there is only 1 rack of suits.
There are definitely bathing suits -- mostly 2 piece. I would say they cater to the smaller sized woman. You're probably OK up to a US size 12. Larger than that or needing large cup sizes and your choices are somewhat limited.