See whether it wants to be tucked in
A thin denim shirt may tuck into trousers without much bulk. A heavier one can create a ridge around the waistband and feel better worn loose. Try the shirt seated as well as standing so you can judge the amount of fabric at the front.
If the hem is long, leaving it open over a simple base layer can be easier than trying to shorten it with a knot. Check that the sleeves accommodate the layer underneath without tightening at the elbows.
Put two denims together deliberately
Jeans and a denim shirt need not match. A noticeable difference in wash can make the two pieces easier to read, while a close match gives a more continuous look. Compare them in daylight, where faded areas and undertones become clearer.
If you prefer just one denim item, use plain trousers, a simple skirt or a dress beneath an open shirt. Keep the first attempt uncomplicated so you can work out whether the shirt length suits the outfit.
Let the finishing details stay useful
A belt can connect a tucked shirt with trousers, but it should not be needed to force the waistband into place. Choose shoes for the setting and check whether the shirt feels too heavy once a coat goes over it.
Dark or strongly dyed denim may have specific care warnings. Follow the garment label and be aware of contact with pale upholstery, bags or other clothing if the maker warns about colour transfer. The styling choice is yours; the care instructions belong to the particular garment.
