I can make you some traditional Dorset sewn buttons if you like..... huge button industry in the 17th/18th centuries. This site
has the more common pinwheel buttons but I have the wherewithals to make the more fashionable and more exclusive 'high tops' which were similarly made but over a small wooden hemisphere.

Most dress pattern manufacturers now publish costume patterns in their catalogues - and the commonest ones (Vogue, Simplicity, Butterick etc) are available online as CatsPhiddle linked.

Of course, if you were in the UK, I could do you a nice mediaeval gown...... male or female!

LTS