From PDFPatternsPlus:
This pattern shows you how to easily make a beautiful curved and shaped crossbody bag with an adjustable crossbody strap and magnetic snap closure. A generous size, great for everyday use, large enough to accommodate all your essentials.
Fully lined throughout with a feature curved phone pocket on the front. Construct an adjustable webbing or self fabric strap, to wear cross body or over the shoulder, or attach a bought leather strap
Skill level: Advanced beginner. This is an easy to moderate pattern
Approximate finished dimensions:
10.25 x 8.75 inches (26 x 22 cm)
I made this example up in Harris tweed, but it is suitable for most medium weight fabrics including tweeds, denim and medium weight cottons.
Make from just half a yard each outer and lining
14 pages of full colour tutorial style instructions with detailed photos will walk you through making a professional looking bag in no time.