I underdress mostly everyday with mostly panties and pantyhose. My wife has told me a number of times to be careful when bending because she has seen the top band of my pantyhose or the lace of panties many times.
A few weeks back we went for a walk on a trail, there were bike rentals there and we decided to ride on the trail. I was wearing a bra and because I thought we were going for a walk I thought nothing of it. My wife was riding a head of me and there were a lot of bike riders in front and behind us. At one point I went in front or her and she told me to pull off the trail and stop. I asked her what was wrong and she said because I'm leaning forward on the bike and sweating my shirt is transparent and she seen all the bra and the flowery working on it and for sure everyone behind will notice it.
Well I couldn't take it of there so I rode the rest of the trail with the back of my bra in full view. I enjoyed the thought of it showing and after a while my wife noticed nobody said anything and she find of relaxed and was kind of getting a little thrill of seeing it to.