There are certain fabric designers that I can say when I see their fabric .. I never look at the price on the bolt, as I just have to have it. Peggy Toole has some of the most irresistable fabrics I have ever seen.
As for tools and supplies...
1. spray basting ... having used some off brands that either left me cleaning my needle ever 2 minutes, or didn't adhere, or smelled bad..
2. Invisable thread .. just not worth the frusration to go "off brand".
3. Specialty presser feet... I stick with the manufactures .
And yes .. I am a scissor snob!