I'd quite agree with the guy fashion style (although I know one ENTP who really likes to suit up), but I have absolutely different experience with ENTP girls (I know only one INTP girl, so I can't see any pattern here). The ENTP girls I know really keep it anything but simply.
ENTP no. 1: really wants to look sexy. Since she was a young teenager she's been wearing big cleavages, lots of jewelery, sexy and elegant "woman" clothes, corsets and ALWAYS high heels. Later she started to wear almost exclusively black, leather, silver, really sexy stuff.
ENTP no. 2: extremely eccentric and original. Also wants to look very woman-like. She NEVER wears trousers and ALWAYS wears high heels. Besides that, since she was 17 she never wears any other color but black and red. When she was younger, she was a big fan of super sexy clothes (black mini skirts, mini T-shirts and reticulated tights), later she made it even more original and wears long skirts, dresses and large hats that remind one of 100 years ago. She wore bright red dress for her early wedding. Naturally she's got fair hair, but she's been dying them black & red since she was a teenager.
ENTP no. 3: also very original. Also ALWAYS wears high heels. Just as the other two, she usually wears black, although she occassionally allows herself some white and blue, and lots of jewelery. She's also a big fan of a Japanese gothic lolita style. Just as the one above, she started to dye her fair hair black long ago.
Therefore I really have to disagree with your assesment of ENTP girls, even though I agree with most of your other descriptions.