How come guys don't give a second look to plain Jane girls?

princess_for_life
i have two friends who are plain Jane looking. no makeup, hair in a bun, baggy sweatpants and t-shirts all the time. guys never notice them or flirt with them or anything.

BUT I've gone out with these girls before. I've seen them slip into a cocktail dress, put on some makeup, and style their hair. they look damn sexy when they do. when we go out these girls are turning heads left and right, getting wolf whistled at, guys trying to get their numbers.

SO how come guys don't look at them normally and only when they dress up? they're still the same girls. and they still have pretty faces no matter what. because they don't wear a lot of makeup when we go out, just a little to enhance.
How come guys don't give a second look to plain Jane girls?
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