Recently, I learned that the Handcrafted History blog contains a wealth of free tutorials--51 to be exact--for projects of various complexity and length. The blog is a wonderful place to explore, particularly if your costuming interests lie in the medieval period.
Many of the tutorials are in English, though some are in Swedish. Many of them are for 15th century clothing, though by no means all--there are a few tutorials for Viking age clothing. and one for a "bathhouse babe" type of sleeveless shift. All are well-illustrated with color photographs. I suspect that the ones in Swedish could be adequately navigated by English-speakers using Google Translate.
Linda, the blogger, runs a small (mostly) historical clothing business. You can find her on Instagram (where I first found her), Facebook, Etsy, and Patreon. Her Etsy site sells kits which consist of patterns and instructions to make small projects. Note that if you decide to contribute to her Patreon account, she will be able to make more free tutorials available on her blog.
EDIT: 12/22/2020 Corrected description about Linda's kits, which include patterns and instructions but NOT materials.