Many mall-based apparel retailers crumbled over the past decade due to shifting fashion trends, the rise of fast-fashion rivals and e-tailers, and sluggish mall traffic. However, one retailer that has weathered the retail apocalypse with style is American Eagle Outfitters (NYSE:AEO), which posted 6% comparable-store sales growth during the first quarter.

This week's earnings report marked the retailer's 17th straight quarter of positive comps growth. American Eagle's comps rose 4%, marking its eighth straight quarter of growth; and Aerie's comps surged 14%, marking its 18th straight quarter of growth.

For comparison, Abercrombie & Fitch's (NYSE:ANF) total comps rose just 1% last quarter, while Gap's comps fell 4%. Let's take a closer look at how AEO outperformed those rivals.

An American Eagle marketing campaign featuring Polaroid snapshots.

Image source: Getty Images.

The "anti-Victoria's Secret"

AEO's core growth engine is Aerie, its lingerie and activewear brand for young women. Aerie branded itself as the polar opposite to L Brands' (NYSE:LB) Victoria's Secret, featuring untouched ads, models of all shapes and sizes, and inclusive body-positive marketing campaigns.

That strategy, which was expanded through social media via its #AerieREAL campaign, paid off as the brand consistently generated double-digit comps growth:

 

Q1 2018

Q2 2018

Q3 2018

Q4 2018

Q1 2019

American Eagle

4%

7%

5%

3%

4%

Aerie

38%

27%

32%

23%

14%

Total

9%

9%

8%

6%

6%

Comps growth by brand. Source: AEO quarterly reports.

For comparison, Victoria's Secret's total comps fell 5% last quarter as it lost shoppers to smaller rivals like Aerie. It also closed 35 Victoria's Secret locations across the U.S., reducing its domestic store count to 922 locations. That said, it opened a single new PINK store and boosted its youth-oriented brand's domestic store count to 142.

AEO opened four new stand-alone Aerie stores during the first quarter, bringing its total stand-alone store count to 119. It also operates 151 Aerie stores linked to existing American Eagle stores. The company plans to open 65 to 70 new Aerie stores (both stand-alone and side-by-side locations) for the full year, which will widen its lead against Victoria Secret's PINK.

A model wearing Aerie swimwear.

Image source: Aerie.

Teen shoppers still love American Eagle

Piper Jaffray's latest "Taking Stock with Teens" survey, which polled 8,000 U.S. teens about their favorite brands, ranked American Eagle as their second favorite clothing brand after Nike. That puts American Eagle ahead of Adidas, Forever 21, and A&F's Hollister, in that order.

American Eagle's jeans, which generated its 23rd straight quarter of record sales, are consistently popular with teen shoppers. It's the largest women's jeans brand in America and the second largest jeans brand overall after Walmart. American Eagle is expanding the jean business' reach with larger sizes for men and women, which mirrors Aerie's inclusive and body-positive strategies.

Abercrombie & Fitch, which reported just 1% comps growth at Abercrombie and 2% comps growth at Hollister last quarter, is struggling to keep up with American Eagle in the teens market. That's why it recently ramped up its Instagram campaigns and launched a high school tour that discussed shopping habits with over 100,000 teens.

Smart digital growth strategies

AEO is a mall-based retailer, but it's aggressively expanded its digital ecosystem and now generates over $1 billion in digital sales annually. Purchases from its mobile apps now account for over half its digital revenues.

AEO's digital sales rose by the low double digits during the first quarter and accounted for 30% of its total revenue, compared to 29% in the prior year quarter. AEO's digital strength gives it an edge against fast fashion rivals like Inditex's Zara, which generated just 12% of its sales from online channels last year.

Will AEO keep surviving?

AEO's consistently strong comps growth and clean balance sheet make it a standout player in the tough retail apparel market.

But there are still flaws. Its gross margin slipped 30 basis points annually to 36.7% last quarter due to markdowns and higher delivery costs for online orders. Aerie's growth is still decelerating as other rivals -- like A&F's Gilly Hicks -- enter the market. American Eagle's jean business also faces tougher competition as Levi Strauss, which recently went public again, ramps up its expansion efforts.

Taken as a whole, I still think AEO's strengths outweigh its weaknesses, and its stock looks cheap at 11 times forward earnings with a forward dividend yield of 3%. This survivor of the retail apocalypse should remain a rock-solid investment for the foreseeable future.