You can't get much less than a pair of pasties. They're seductive and anything but subtle.
If your man is a creative maker-type like mine, make him a special treat he'll fully appreciate by combining two of his favorite things: paracord and perfect breasts.
Since I offer no pictorial proof to support my hinted claim of mammarial perfection, let this mixing bowl representation stand in my place. (It's actually far more accurate than you may suspect, in size, general positioning, color....)
Alright, let's make some pasties!
Step 1: Make pattern
Make a circular paper pattern as shown with a radius of 1 3/4", and remove one quarter of the circle. Curl it together so the straight cut edges join up and, and connect them with a piece of masking tape. Test fit and adjust if needed--bigger or smaller, and more or less pointy.
These are made out of sticky-back craft foam. They are made with the sticky side out, to easily attach the paracord (or sequins, feathers, or whatever).
They are held in place on your body with washable glue stick.
Step 2: Cut out foam
NOTE: I made a couple versions of these as I was figuring it all out, and used some photos from both assemblies for this instructable. Hence the differences in the craft foam color, and so on.