Meaning, in context, of the idiom 'whole cloth'

I want to ask a question which is oft-repeated question. And it might lead you to imagine that I am asking it again. Even, in this website, it has proposed before. But, as a matter of fact, I haven't understood all of its meaning yet. This idiom is whole cloth. There are a lot of definition for this idiom on the internet.

First, I'll link to the three definitions of whole cloth that appear in Wiktionary:

1. A newly made textile which has not yet been cut. 2. (figuratively, used attributively or preceded by various prepositions) The fictitious material from which complete fabrications, lies with no basis in truth, are made. 3. Something made completely new, with no history, and not based on anything else.

I have come across this idiom in the following two contexts in which I don't understand the meaning of the sentences completely. First, in an article by G.H. Cohen:

The relationship between theory and political practice is more complex than some friends of the Labour Party appear now to suppose. The point of theory is not to generate a comprehensive social design which the politician then seeks to implement. Things don't work that way, because implementing a design requires whole cloth, and nothing in contemporary politics is made out of whole cloth. Politics is an endless struggle,and theory serves as a weapon in that struggle,because it provides a characterisation of its direction, and of its controlling purpose.

Second, in an English translation of Karl Marx's "The Eighteenth Brumaire of Louis Napoleon," chapter 1:

Man makes his own history, but he does not make it out of the whole cloth; he does not make it out of conditions chosen by himself, but out of such as he finds close at hand.

Which meaning of this idiom fits in these sentences? I know the meaning of it in more simple sentences such as:

His account of being drugged, kidnapped and tortured was made up of whole cloth. [George Carver]

But I don't know it in the above-mentioned sentences.