Well I posted in another thread how my wife's bikini is a bit see-through when wet and the light is hitting in the right angle. She knows this since very well but can play innocent when being exposed a bit in the swimming pool.
Now today, she wanted to try another bikini she found in the closet and had forgotten about.
It's one showing much more cleavage but isn't see-through (though her nipples still point through the fabric when hard).
At home, I commented that the bikini looked good on her and wasn't see-through like the other one.
Her reaction to me was : "You know I don't care about people seeing my nipples and areola's, I just want a bikini that makes my breast look good"