Including Banana Republic, Amazon, Nordstrom, and moreCredit: Frazer Harrison / WireImage; AmazonReese Witherspoon must have been channeling her production company, Hello Sunshine, in her recent Instagram reel, because she wore a bright yellow, striped button-up shirt that embodied summer vibes.Witherspoon has been a style icon since before her Legally Blonde days, and we’re still looking to her wardrobe for fashion tips. In the video, the actre…