With visible seams or flat seams
Short answer: A flat seam lies level against the skin and chafes less, while a visible seam is more traditional and often stronger. Choose flat seams for close fitting clothes, exercise and sensitive skin, and visible seams where strength and appearance matter most.
How the two seams are built
A visible seam is classic: two fabric edges are laid against each other and sewn together, leaving a small ridge on the inside or outside. A flat seam lays the edges over each other or together, so the transition is smooth. The flat seam requires a special machine and is used especially in underwear and exercise clothes. It gives a more even pressure on the skin and fewer chafe marks. That is the difference you can feel with a finger when you run it across the seam.
Where a flat seam makes the biggest difference
Flat seams are most useful where clothes rub against the skin in motion: beside the chest, under the arms and around the groin. See bamboo sports bra, where seams under and around the chest are particularly important because they are in constant motion. On longer outings or during exercise, a visible ridge can cause sore spots, especially if you sweat. The flat seam sits better under clothes and shows less.
Where a visible seam is fine
In loose clothes that do not lie close to the skin, a visible seam causes no problems. It is often stronger and can take more strain. In thicker fabric, knitwear and everyday clothes, a classic seam is solid and simple. Many also think it looks neater. See JBS of Denmark as an example of clothing for everyday use, where you can see for yourself how the seams are made.
Close fitting clothes and bodysuits
For close fitting clothes, where the fabric follows the body, fit and seam are part of the same choice. See bamboo bodysuit, which sits close and therefore needs smooth transitions. Here you feel every seam, especially if you wear the garment for many hours. Try the clothes on and notice whether the seams press or chafe when you sit, stand and move.
Caring for seams
Seams are where clothes most often start to come apart. Wash inside out, use a gentle programme and avoid pulling hard on the garment when you take it off. Snip loose threads instead of pulling them. If a seam begins to loosen, sew it up quickly, because a small hole can grow large. Viscose from bamboo is softer and a little more delicate than thick cotton, so treat it gently.
Our recommendation by situation
Choose flat seams for underwear, sports bras, exercise clothes and anything that lies close to the body. Choose visible seams for loose clothes, thicker fabric and garments where strength matters. If your skin is sensitive, go for flat seams or clothes with seams on the outside. Try the clothes on and move, because only in motion do you feel whether the seam chafes.
Frequently asked questions
Are flat seams stronger
Not necessarily. They are more comfortable, but strength depends on thread and stitching.
Why do seams chafe
Because they lie against the skin and rub when you move. Flatter seams do so less.
Can I turn the clothes inside out to avoid the seam
Some garments can be worn with the seams outwards, but that is not always practical or neat. Rather choose clothes with flat seams.
You can find the full range at Bamboo-Clothing.com.
