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 _in_ it; for it is to
be remembered that the very fact of its being the iron or foundation
age gives opportunities obtained in no other. It is only a quarter as
long as the longest of the other ages, and it is therefore crammed
four times as full of life and activity. Hence the rapidity with which
all things come to pass in it. A very slight cause produces gigantic
effects. To aspire ever so little now will bring about greater and more
lasting effects for good than at any other time. And similarly evil
intent has greater powers for evil. These great forces are visibly
increased at the close of certain cycles in the Kali Yuga. The present
cycle, which closes Nov. 17th, 1897-Feb. 18th, 1898, is one of the most
important of any that have been. Opportunities for producing permanent
effects for good in themselves and in the world as a whole, are given
to Theosophists at the present time, which they may never have again if
these are scattered.