Briefs under tight trousers and how to avoid edges
Short answer: A visible edge comes from an elastic thicker than the fabric around it. The answer is a laser cut edge, a different cut or denser trousers.
Laser cut edges
A laser cut edge has no elastic and no seam. It lies flat against the skin and forms no line. That is the most direct answer. See bamboo briefs.
The cut is the second route
If the edge runs diagonally up towards the hip, it follows the line of the leg itself and shows less. That is why a tai shows less than a hipster.
Seamless models
Seamless briefs are knitted in one piece with no side seams. They have neither edges nor seams that can show. See bamboo underwear for women.
The trousers matter too
Thin, light trousers show everything. More densely woven trousers hide edges whatever brief you have on. The measurements are in guide to briefs and underwear.
Frequently asked questions
What is a laser cut edge?
An edge cut without seam or elastic, so it lies flat against the skin without forming a line.
Which cut shows least under trousers?
A tai or a seamless model. The diagonal leg opening follows the shape of the leg.
Does a larger size help against visible edges?
No. It is the thickness of the edge and not the size that forms the line.