Are my wife's shirts drawing the wrong kind of attention?

[Thomas]

My wife and I have been married for four years. She is a great woman and is usually very conservative in her clothing and behavior. One argument we have had is over her habit of buying t-shirts with slogans on them that she thinks are funny and I think are inappropriate and draw the wrong kind of attention. For example, she has one shirt that says "Just one more drink and I'll let you get it in my eye" and has an illustration of a cowgirl winking. Another one is a sort of baseball style shirt for a made up team called the "Swallows." She wears these and others about once a month so not all the time. She thinks these are hilarious to wear but occasionally a guy will get the wrong idea and hit on her. I can't blame them for this attention when they see her in this stuff but it bothers me. Yesterday an older man in the grocery store said he wanted to take her up on her offer. It makes me upset that she get this attention, but am I overreacting as she says? Are these things funny or should I worry that she chooses to wear them? I want her to be safe and not get this bad attention from random older men.