Levi Strauss (LEVI) could be a solid addition to your portfolio given a notable revision in the company's earnings estimates. While the stock has been gaining lately, the trend might continue since its earnings outlook is still improving.Analysts' growing optimism on the earnings prospects of this jeans maker is driving estimates higher, which should get reflected in its stock price. After all, empirical research shows a strong correlation between trends in earnings estimate revisions and near-term stock price movements. This insight is at the core of our stock rating tool -- the Zacks Rank.The five-grade Zacks Rank system, which ranges from a Zacks Rank #1 (Strong Buy) to a Zacks Rank #5 (Strong Sell), has an impressive externally-audited track record of outperformance, with Zacks #1 Ranked stocks generating an average annual return of +25% since 2008.For Levi Strauss, strong agreement among the covering analysts in revising earnings estimates upward has resulted in meaningful improvement in consensus estimates for the next quarter and full year.The chart below shows the evolution of forward 12-month Zacks Consensus EPS estimate:12 Month EPSCurrent-Quarter Estimate RevisionsFor the current quarter, the company is expected to earn $0.37 per share, which is a change of +362.5% from the year-ago reported number.The Zacks Consensus Estimate for Levi Strauss has increased 7.45% over the last 30 days, as two estimates have gone higher compared to no negative revisions.Current-Year Estimate RevisionsFor the full year, the company is expected to earn $1.34 per share, representing a year-over-year change of +538.1%.There has been an encouraging trend in estimate revisions for the current year as well. Over the past month, four estimates have moved up for Levi Strauss versus no negative revisions. This has pushed the consensus estimate 20.54% higher.Favorable Zacks RankThe promising estimate revisions have helped Levi Strauss earn a Zacks Rank #2 (Buy). The Zacks Rank is a tried-and-tested rating tool that helps investors effectively harness the power of earnings estimate revisions and make the right investment decision. You can see the complete list of today's Zacks #1 Rank (Strong Buy) stocks here.Our research shows that stocks with Zacks Rank #1 (Strong Buy) and 2 (Buy) significantly outperform the S&P 500.Bottom LineWhile strong estimate revisions for Levi Strauss have attracted decent investments and pushed the stock 7.3% higher over the past four weeks, further upside may still be left in the stock. So, you may consider adding it to your portfolio right away. Bitcoin, Like the Internet Itself, Could Change Everything Blockchain and cryptocurrency has sparked one of the most exciting discussion topics of a generation. Some call it the “Internet of Money” and predict it could change the way money works forever. If true, it could do to banks what Netflix did to Blockbuster and Amazon did to Sears. Experts agree we’re still in the early stages of this technology, and as it grows, it will create several investing opportunities. Zacks’ has just revealed 3 companies that can help investors capitalize on the explosive profit potential of Bitcoin and the other cryptocurrencies with significantly less volatility than buying them directly. See 3 crypto-related stocks now >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Levi Strauss & Co. (LEVI): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research