Do you have any tool that you use all the time? Do you recommend it to everyone unprompted? Is it ridiculously specific to your situation, wants and needs? Let every one know how they can make their sewing better!!
I myself don’t have any at the moment, but I have been eyeing a nice pair of left-handed fabrid scissors for quite some time and I might get it some day.
I have another one: A mini iron to press seams open!
(…she wrote, sitting in front of her sewing machine, having sewed a seam that really needs to be pressed open before proceeding, and having spent the last five minutes trying to press said seam open with the handle of her shears, because the laziness is strong with this one, and who can be bothered to stand up to set up the ironing board?)