If you're living in a bombed-out slave dystopia under Combine rule I doubt you'll have time (or place) to go shopping for the latest Gucci and have your nails done. Nope, you'll be tinkering with guns and heavy machinery instead. The girly-girl type would've died out long before Gordon awoke.
Apparantly she still has found the time to go out and buy a pair of low-cut jeans.
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I can respect Alyx for her small boobies which make her stand out in contrast to most female video game characters. She is still a pointless character though who was inserted into Half-Life soley for sublte sex appeal to lasso in the legions of impressionable gamers out there.