How big the weave is depends on your choice of cloth. This enlarged picture here shows there isn't any weave visible, while at the same time the ratlines show through the cloth. A matter of choice...
There are many materials that can be used for sails. Plastic sheet, for instance. Like you I'm not a purist and I use whatever gives me a pleasing result. Apparently cloth works for me, paper or plastic for somebody else. But one nice thing about our hobby is that we can do things our own way. Nobody is wrong, as long as you like what you make...
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