All the seams and embroidery in this blouse are stitched by hand. The stitches are pretty large but the blouse is almost 40 years old so obviously they were strong enough. All the seams are finished so that no raw edges show.
Here is a picture of the side seam on the outside showing the stitches. You can also see the texture of the cotton fabric.
This is a view of the inside yoke, and you can see the underside of the running stitch embroidery and the whip stitches holding the body portion to the yoke.
This is the seam around the gussett. The edges of the seam allowances are turned under and whipped down to hide the raw edges. This would make it much more comfortable to wear.
A closeup view of the yoke embroidery and the ruffle top of the body portion.
This is the underside of the yoke portion showing the upper edge of the yoke. The yoke straps and the yoke portion are made from two layers of fabric.
I have some lengths of hand crocheted lace and insertion that I used to use as handwork when I went somewhere since the work was small and would fit in my purse. I am thinking that I could make a whitework peasant blouse with tucks and lace trim and maybe crochet on the edges of the yoke top and sleeve hems. This blouse would lend itself to many different techniques for trimming.
I am so glad that you showed the inside of the yoke. The body of the shirt is actually cartridge pleated to the yoke rather than gathered. I suspected as much when I saw the right side but it became crystal clear when I looked at the detail picture you posted of the inside yoke. I am totally envious of your vintage mexican top! I am in process of hand embroidering a mexican blouse for myself and the pictures of all of your blouses were such a delight to look at! I am going to try cartridge pleating mine, I love the ruffle it creates. Thank you for posting the schematics of your top and the measurements. I am really excited to try reconstructing a blouse for myself using your information.