Linds Handmade
This is a beginner friendly pattern that does require the sewer to have a general familiarity with bag making and sewing terms.
Specs: it is 9 1/2"w by 5 1/4"h when opened, and 5 1/4"w by 3 1/2"h when closed. It has 2 card slots, 1 ID window, a zippered coin pocket, and a zippered cash pocket. There are instructions for both a hook and loop (aka Velcro®) closure or snap closure option.