I was not a fan, to put it mildly, but here is a somewhat interesting piece on Mrs T's clothes, claiming that she pioneered power dressing. It's interesting to speculate on what she would have worn had she been PM in a later or earlier decade
Marianne Abrahams, then design director of Aquascutum, which made most of her clothes, said at the time: "She knows precisely what she wants and she's particular about the fit of the shoulders."
Those "power shoulders" typified her style as much as the omnipresent pearls and round-toed Ferragamo court shoes with stout 3cm heels. The tailored jacket and skirt was often in navy or sapphire - her favourite, "my party's colour". But she liked to vary the diet with forays into fuchsia or cerise.
Her suits were in good, serviceable British cloth, checked tweed or a gleaming brocade; indeed, any fabric was welcome as long as it did not wrinkle, because of the amount she travelled. She once said she found suits more practical than ball-gowns.