Someone was asking about adding just a ¼” seam allowance which apparently is what is used in patchwork and quilting. There is a nifty little gadget called Quilters Wonder Wheel which is made of brass, so a tiny wheel with a hole in the middle in which you insert a pencil and then position the wheel against your pattern/template edge and just draw around the shape you need, excellent on curves and on straight lines.
It is a product from the USA and I found mine years ago in a quilting and patchwork shop that has now long gone. From the packaging I will say this is one that was marketed by W.H. Collins, Inc. in the USA.
Just one of those many useful haberdashery items that we see from time to time and buy because we can see a use for this.