Knickers without visible lines, how to choose

Short answer: Choose a style with a cut edge, a skin tone under light clothing and a size that does not squeeze. The edge shows when fabric presses into the skin, so fit matters as much as the style itself.

Cut edge rather than sewn edge

A cut edge is thin all the way round and leaves no line under the fabric. A sewn edge is thicker, because the fabric is folded and stitched, and it shows more easily under close fitting clothes. That is the key difference. See the styles in bamboo panties, where you can compare the edges on the different cuts.

A tight size creates the line

Even a thin edge shows if the fabric squeezes and pushes the skin up around it. Often the size, not the style, causes the problem. Choose your usual size and check in the mirror that the edge lies flat against the skin without digging in. If it still feels tight, try a size up rather than a new style.

Colour matters a lot

Under light trousers and dresses, colour shows as much as the edge. White underwear often shines through light fabric, while a skin tone close to your own blends in. Keep a few pieces in a skin tone for days in light or thin clothes. Under dark clothes, colour matters far less.

Long legs are the safe choice

A style with long legs places the edge further down the thigh, where clothes are less often tight. That moves the edge away from the places it shows most. It suits dresses and loose trousers well. Long legs are also comfortable day to day, for instance under soft wear like a bamboo sweatshirt for women.

The bra can leave lines too

The same principle applies higher up. A bra with thick edges or tight straps can show under a close fitting top. Choose a soft, wire free style with smooth edges, and make sure it does not dig in under the arms or across the back. See the soft styles in bamboo bras, which lie smoothly against the skin.

Fabric makes a difference

A thin, smooth fabric lies close to the skin and shows less than a thick one. Bamboo viscose is soft and drapes well, so it follows the body without bunching. A little elastane keeps it in place so it does not creep. Thin fabric and a cut edge together give the calmest result under clothes.

Try it with the outfit

The surest test is to try the underwear with the clothes you plan to wear. Put on the light trousers or the fitted dress and look in the mirror in daylight. Sit down too, since the edge can show more when fabric tightens over the hips. Then you know before the day begins.

Care that protects the edge

A cut edge lasts best away from high heat. Wash at 40 degrees, skip the tumble dryer and dry the panties flat. Avoid fabric softener, which can make the fabric less smooth. A laundry bag stops the edges catching on other clothes and stretching, so they stay flat for longer.

Frequently asked questions

Is a thong the only solution

No. Cut edges and long legs work just as well for most people, and many find them more comfortable over a full day.

Why does the edge show most on light trousers

Because the contrast is greater. Under dark clothes the same edge is less visible, while light fabric shows both edge and colour more clearly.

Does a smaller size help

No, it usually makes it worse, as the fabric presses harder against the skin. The edge shows most when fabric is tight, so stick to your usual size.