“you better check your seforim again, and i’m serious. Once a women is married hair has the status of erva. “
Nobody is disputing that fact with you, please re-read what I wrote. Her actual HAIR absolutely has the new status of erva once she is married, just as she has the status of tehora when she goes to the mikvah, something she could not do or be when she was still single.
Nowhere that I am aware of does a mainstream accepted Rov say a married woman must cover her head with something ugly. You are presuming that the reason for the halacha is that ANY hair that looks like her own hair, is ALSO erva and untzniusdig, when it may merely be that the actual hair physically growing from her head is the erva AND NO OTHER HAIR THAT SHE WEARS IS A PROBLEM, because it is not her own natural hair. If that is the case, then you might be mistaken. The reason for covering the hair is that Hashem commands it, and thereby this part of a woman’s body is reserved for her husband’s eyes and no other man. There may be many suppositions regarding reasons for this mitzvah, which is not delineated beferush in the Torah Shebichsav, but at the end of the day, suppositions are not halacha.
As to your analogy of wearing a dress that looks like her body, do you honestly not see a difference between wearing a wig that looks like the hair that is permissible to be seen before marriage, and a dress resembling the female form, most of which is NEVER permissible to be shown where men might be at ANY time? Please, this argument makes no sense at all. Hair is not intrinsically untzniusdig, UNTIL a woman has acquired the status of eishes ish. The female body according to most poskim, except for the lower arms, lower legs, head and upper neck, is ALWAYS untzniusdig if uncovered. It is simply not the same thing at all. Nice try, though.