Jeans are constructed with several seaming techniques but the seam you are probably inquiring about is the "flat-fell" seam. Sewmetheway
flat seam is used for decorative purpose. Seam edges do not overlap but flatted together. Seam is constructed with a minimum of 3 fabrics.
The three types of seam are Plain seam, French seam and Ancient or Old German flat seam.
a flat fell seam is a type of stitch that joins materials together. you would use a flat fell seam for something like denim because it is the strongest type of stitch.
There are 11 types of seams which include: abutted, enclosed, exposed, false french, flat-felled, french, fused, glued, hairline, lapped seam with raw edges, and finally overedged seam.
An open seam is a general purpose seam. An open seam is two pieces of fabric sewn together, and then the seam allowances are pressed open, creating a flat and clean seam line on the right side of the fabric.
To make a French seam you sew your seam right sides together. at 5/8th in.... Then you trim away half of one side of the seam.... Then you press the seam towards the shorter half. Then you fold the longer half over the narrower half and press..... then you stitch up the flat open side..... that makes a double sewn seam called Frenched seaming.
They used scissors and needles. Thread and fabric are tools they use. they also propbaly used diffrent kinds of frabics
flat felt seam
Three self-neatened seams include the French seam, the flat-felled seam, and the bias-bound seam. A French seam encloses the raw edges within a folded seam, providing a clean finish ideal for lightweight fabrics. The flat-felled seam features one seam allowance folded over the other and stitched down, creating a strong, durable seam commonly used in denim. The bias-bound seam encases the raw edges in bias tape, offering a neat finish while allowing for flexibility in fabric types.
A quilt.
Ah, a flat-felled seam is like a little hug for your fabric pieces. It's when you fold one edge over the other and stitch them together, creating a smooth and sturdy finish. It's a lovely technique that adds both strength and beauty to your sewing projects. Just remember to take your time and enjoy the process!