I've read a while ago this article about the evolution of woman underwear during XX century, well mostly from 1920s. And I do like this picture a lot, 'cos you can see a big part of the undergarments modern women (those who abandon their corset, not all of them did, you know?) wore during 1920s: slips, stockings, girdles and all.
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well...we, girls/women, can't expect guys to not show their underwear if we aren't willing to cover up ourselves. yes, bra straps aren't a big deal in the scheme of things. but we should be modest regardless.