Making sure your garment is well pressed is the number one most important key to achieving clothes that look well made. Trimming the seams to make them lie as flat as possible is the number two. I'll demonstrate with a pocket flat from my current project, another jacket.
1. Sew the two pieces together, right sides facing in.
2. This is called "grading the seams". Or at least, that is what my mother calls it. You want to neatly trim at least one side of your seam allowance a shorter width then the other. I always trim them both.
***I grade all seams that are sewn and then turned to the inside, like facings, collars, sleeve tabs, pocket flaps, lapels, etc. Anywhere there are two or more layers side by side and not pressed open.
3. Now, clip the curves. I use to just put a single clip in, but have discovered in the last 6 months that if you cut notches in tight curves, they lay a lot flatter. The tighter the curve, the more notches it needs.
4. Now turn to the outside and pin. I am a crazy pinning machine.
***Oops, after you pin, then you give it a good pressing.
*****You pin to get a crisp outer edge to what you're working on.
5. Ta da!
I want to do more tutorial type posts but don't know if you find them interesting or have any requests. I think Angie asked me recently about inserting linings in skirts, and the next time I sew one I plan to take pictures of the process. Is there anything else you'd like to see a tutorial on?