See the post directly above me for an indication about how you should navigate these waters. From intrepid sailmaker to Wal Mart...that's about the same story as a lot of brands we see in thrifts and avoid like the plague.
*******All points bulletin for all of those trying to score big on vintage outdoor gear************
Don't buy just anything that you feel is "techy" or well made. Just the same way that you pass on Canali Proposta and Hart Schaffner Marx Gold Trumpeter, you should also pass on baggy nylon ski jackets from the 80s and 90s.
What you are looking for is 60/40 (60% cotton 40% nylon shell) clothing, preferably with down fill. This is just the tip of the iceberg as lots of pieces might advertise this but don't have the name recognition to go with it.
Anything with a synthetic shell and synthetic fill should generally be avoided. This includes the Descent jacket posted above and the White Stag brand Spoo is asking about. There are countless brands to avoid so it's not worth making a list, unless you are finding Canada Goose, Stone Island, Aspesi, Moncler, etc all of which are in the MUST KOP category. These brands have always and will always make quality product.
I won't list the brands to look for...ask Nat as he has an even wider compendium than myself. Things that flip well will be ones seeing a revival in style. Descent and their ilk of nylon ski shells haven't and probably won't be revived in style. I can see Opening Ceremony making a capsule collection with a brand known for its neon colorways, but I don't see Unionmade and other heritage based stores reviving these styles.
Just like with MC, casual performance clothes see a rise and fall in colorways, styling, and materials. You should be monitoring what is popular with stylish people if you have any intention of flipping product.