Under "tutorials and (free) patterns" I have mentioned only those sites that also have free and/or unusual stuff on offer. After all, we all know how to find the nearest pattern seller. I'm sure I forgot a great source of historical sewing patterns, but I didn't bookmark the site, so I can't find it right now.
added comment: I have just found the site I was looking for, fortunately the URL was on a pattern I downloaded from there. I've added it to the list.