Last night I was playing poker at the casino. A combination of where I was sitting, bright lighting overhead, and a poorly fitting blouse gave me a pretty full view of the inside of a dealer's shirt. I was doing my best not to look but (like most people I think) when I actively try to not look at something I often find myself looking at that exact thing when my focus drifts.
I felt uncomfortable saying anything at a table full of guys and wasn't sure what would be the appropriate thing to say as the cause could have easily been that she is larger than when her uniform was assigned.
Should I bring it up? If so what is a socially acceptable way to say that the space between your buttons is wide open?
Related to, but substantially different from the following question as the root cause of lack of coverage isn't something that can be immediately remedied: Is it appropriate to tell someone of the opposite gender "your fly is down"?
Just for clarification based on several comments: Due to rules from the union, dealers share tips in a pool of 100+ people without even any sort of tracking who individually collected what. Given the low percentage of additional tips a dealer would see (<1%) I see it as unlikely that tips would be a significant factor in this situation. Good thing to consider in similar situations but not applicable in this specific one.
Update on this:
I think most had interpreted this as cleavage out of the neckline rather than between the buttons. Turns out she was pregnant and just starting to show which caused her shirt to fit tight down low and loose up top and distort in the middle. She shortly afterwards switched over to the maternity uniform which fit much better.