As a married man, I bought clothing for my wife (really). Everyone was very helpful. When I returned a Medium item to exchange for a Large, the customer service woman thought I was very astute for guessing too small rather than offending my wife by guessing too large.
All to explain that a man shopping for women's clothes is seen as quite normal.
Now that I buy for myself, I braved the Walmart changing room attendant without problems. She just asked about my women's jeans, "Did you want the men's?" and had no problem when I answered no, these are fine. As others have said, they don't care.
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