Shares of Stitch Fix (NASDAQ: SFIX) soared 12.4% on Friday, extending a nearly 9% pop yesterday despite a lack of company-specific news. Rather, with the help of the broader market's rally today, the personalized apparel company appears to be riding a wave of recent positive momentum.IMAGE SOURCE: GETTY IMAGES.For perspective, recall Stitch Fix only just held its initial public offering in November 2017, leaving it still susceptible to some post-IPO volatility.