The plural possessive is "ladies'." "Lady" is singular, so if you were referring solely to one woman's shoes, it would be "the lady's shoes." As for your second question, I'm assuming you're referring to a group of women in your salutation of them, so it would be "Good morning, ladies." And as you're addressing them directly, the comma preceding "ladies" is necessary.
Yes, milady comes from "my lady". Milady (from my lady) is an English term of address to a noble woman. It is the female form of milord. And here's some background on milord: In the nineteenth century, milord (also milor) (pronounced "mee-lor") was well-known as a word which continental Europeans (especially French) whose jobs often brought them into contact with travellers (innkeepers, guides ...
These seats are reserved for ladies. The old lady running the roadside lunch house brought him rice and curry. The new District Collector is a lady. Calling somebody a 'woman' is usually perceived as rude here, with the notable exceptions of news journalism, law, bureaucratese and scientific literature: Bangalore woman wins Maths Olympiad.
A lady or a woman? - English Language & Usage Stack Exchange
I have been wondering about this little problem for a while now. Everyone understands that, in the binary, the opposite of 'man' is 'woman', and the opposite of 'gentleman' is, namely, 'gentlewoman'.
Hindustan Times on MSN: Quote of the day by Lady Gaga: 'I am a feminist, I reject wholeheartedly the way we are taught to perceive women'
Lady Gaga turns 40 – her 2010 views on feminism are still relevant today. On her birthday, here's one of her iconic quotes that's on point.