ujm, the original post was definitely not correct, and doesn’t show the halachic requirements at all. It’s been discussed already, but just to name a few:
Wearing dirty clothing isn’t immodest. It may be inappropriate, but it isn’t immodest. If you walk outside wearing dirty clothing by mistake, you’re not transgressing anything.
Bright colored clothing can be permitted. Can you show me somewhere it says it’s not? It’s just a chumrah, nothing more.
Who says an unmarried woman’s hair must be tied back?
Who says makeup and perfume are only for use with a woman’s husband?
Again, the original poster listed mostly chumras, not halachos.