REI - casual and athletic. I think Chewy is right on the mark here. I bet you could get away with your best dark wash denim, and top/jacket in eco-friendly materials in earthy colors?
Talbots - classic and conservative - your suit separates may work fine for this, but I would not necessarily wear a matchy-matchy suit. I would opt for something flattering but not super-trendy. If you don't own Talbots clothes, go with something in their color palette if you have it. Check out their site, but as general rule of thumb, tomato red, black, white, yellow will work. Think strong, primary, classic colors.
Jcrew - think Michelle Obama! Here again if you don't own Jcrew, find something that matches their color scheme. Flip through their site and you'll get a sense of it. The colors to my eye seem best for Springs (think: Ana colors). For this interview, a matching pants suit in a light summery color would probably work just fine, but that wouldn't be your only option either. A pencil skirt with a cardigan would be sweet. A sleeveless sheath with a cardi would also work just fine. I would also put some attention into accessories for this interview. Flower pin, chunky pearls, charm bracelet (see their accessories to get ideas). And do wear ballet flats! In my mind, Jcrew is all about the ballet flat.
Yeah... if I was interviewing at Jcrew I would go with: pencil skirt, silk shell with ruffle or other interesting detail, crewneck cardigan, long strand of pearls, ballet flats... all clothes in soft muted colors.
For Talbots I'd go with a black/white checked pencil skirt and a red suit jacket with a white shell, black patent low heels (conservative-looking pump), and short strand of gumball pearls. All pieces giving a "timeless" vs trendy look.. because that is what Talbot's aims to achieve.
For REI, I'd be stumped... since casual and athletic, boho and eco aren't really my style. Possibly I'd choose the brown dress with leggings outfit on today's blog! Or dark denim trouser jeans, bronze flats, earthy-green cotton top, khaki short-sleeve jacket. Minimal jewelry.
Good luck!!!