In answer to your questions:

(1) Clothes and astral form.

Answer.—You are incorrect in assuming that clothes have no astral form. Everything in nature has its double on other planes, the facts being that nothing visible in matter or space could be produced without such a basis. The clothes are seen as well as the person because they exist on the astral plane as well as he. Besides this, the reason why people are seen on the astral plane with clothes of various cut and colour, is because of the thought and desire of the person, which clothes him thus. Hence a person may be seen in the astral light wearing there a suit of clothes utterly unlike what he has on, because his thought and desire were on another suit, more comfortable, more appropriate, or what not.

(2) What can true and earnest Theosophists do against the Black Age or Kali Yuga?

Answer.—Nothing against it but a great deal ............