I'm ex crew, when I was first employed we were weighed at the interview. We had strict guidelines in regards to appearance and had training on how to dress and apply make up etc. We were also tested in regards to things like the height of heel we were allowed to wear (in the cabin and outside of the aircraft cabin/dress shoes), type of nail Polish and even which hand to carry our handbag or crew bag in.
I think the decline of the industry and the introduction of low cost airlines has lead to the decline of standards in regards to appearance (this isn't a reflection of my view which is subjective). Also the equality movement has meant that not fitting the traditional appearance of what cabin crew was has changed.
What I will say is being a member of cabin crew is a lot more than looking pretty and serving drinks. CC are tested prior to each flight to ensure they are able to meet the safety and first requirement of their job. Imagine being tested at 2am on the pre flight check (how many, where, if there any signs of use, use by date etc), how to use in detail a piece of equipment (could be anything from a specific fire extinguisher bcf or water to oxycrew to the procedure for an evac on ground to a toilet fire to pilot incapacitation to decompression to.a hijack.... you get the idea) then being tested on any aspect first aid (nose bleeds, heart attacks, stroke, anaphylaxis,broken bones, birth......). Think of the scenarios ditching on the sea (if you manage to survive), life rafts, food equipment to take, landing on the ground in an emergency, fires, terrorism, hijacks . CC are trained for a million possibilities and hope they don't face any.
They then board 100-450ish people who judge them on their appearance. They get them seated, resolve any issues and get them to.their destination.
They may also have been called from home with one to two hours notice.
Not many people meet the requirements to be CC. You require no convictions/ dbs (or whatever it's now known as), a full five history with no gaps that can be proven for an air side pass, height requirements, swimming requirements, healthy, the ability to pass the course and exams plus the other skills and qualifications to work with the public and need to pass a x-factor style recruitment. Then and most of all the ability to smile at complete idiots on top of everything else.
I think the industry has declined unless you want to pay a premium.