Clothes that feel fine standing still can feel very different on a bicycle. If your missionary's assignment includes bikes, add a quick movement test to the fitting before they leave.
Try a riding position
Have them sit and bend their knees in the pants or outfit they plan to wear, and watch for pulling at the waist, seat, and shoulders. Stretch fabric helps, but the cut and size still have to work for their body.
The Flex UP Pant has a gusseted crotch, and the 4-Way Flex Pant Air has a lined seat and an expandable waistband. Compare details like these during a try-on instead of going by the word "stretch" alone.
Watch loose fabric and straps
Hems, shoelaces, and bag straps need to stay clear of moving bicycle parts, and anything wide or flowing deserves a second look. Sisters should follow the mission's clothing instructions and test any permitted riding outfit for both coverage and freedom of movement. A layer underneath won't by itself keep loose fabric away from the chain or wheel.
Plan for changing conditions
Picture a cool morning, a warm ride, and a rainy afternoon in the same day. Layers that are easy to manage help, and it's worth deciding ahead of time where anything that comes off will be carried. Follow the mission's bicycle-safety instructions for helmets, lights, visibility, and road use; reflective details on a bag help, but they're only one piece of the preparation.
Try the shoes and a loaded bag
There will be plenty of walking as well as riding, so have them try the intended shoes with their usual socks and check the fit and grip. Pack the daily bag, adjust it, and make sure it stays secure without getting in the way of steering.
A short practice outing in a safe spot before departure can catch an awkward strap or a restrictive waistband while there's still time to fix it. If you'd like help comparing fit, contact our team.