You're asking us to write a book. With several illos per page. "The Middle Ages" is at least a thousand years (more if you don't believe in the Renaissance), from the Arctic to the Sahara, from the Atlantic to the Urals, of the poor, wealthy, and middling, with specialized subsets like religious costume. That's just covering the European sphere, without moving seriously into Africa and Asia. I'm used to 3" thick oversized books just on theatrical costume in China! I could type all day just defining clothing terminology off the top of my head, starting with all the forms of hennins (the "princess hats" with veils, that were worn for only a century in Western Europe).

http://thecostumersmanifesto.com/costumeoldsite/history/100pages/costhistpage.htm is a good start. In B&W there's http://archive.org/details/historyofcostume00khle

Go to the library and look for any "lap-breaker" thick with coloured pictures of period artwork, like Boucher, not pen & ink drawings like Gorsline. Really, trying to tell you in words is almost useless: you need to see the picture when someone says, "houppelande of grain scarlet diapered silk with foliated dagged sleeves and arum-lily collar."

As for expense, there's cheap stuff for the serfs and stuff covered in gold and gems for the royals, and all points between. Whether a pair of gloves costs one cow or twenty depends on time, place, & materials (gloves were always very high end and difficult to make).