Two days before its second-quarter earnings report, lululemon athletica inc. (NASDAQ: LULU) was hit this morning with a steep price-target cut. RBC slashed its price target on LULU from $47 to $30, noting "a 200 basis-point increase in our cost of equity assumption." The analysts tempered their bearish note by reiterating an Outperform rating on the shares.

The brokerage firm's downwardly revised target represents a 64% premium to the stock's closing price Monday. By contrast, the average 12-month price target on LULU is $39.72, according to Thomson Financial. This consensus estimate is 117% higher than yesterday's close, which seems to indicate that further price-target cuts could be in the offing, particularly if second-quarter earnings fail to impress.

During the past four quarters, First Call reports that lululemon has met or exceeded analysts' per-share profit expectations every time. However, it's safe to say that nobody on Wall Street was particularly impressed by LULU's last quarterly earnings report. Since the company announced inline earnings of 12 cents per share on June 2, its shares have shed 43% of their value. Even more compelling, institutional investors have reduced their stake in LULU by a net total of 5% since last quarter.

The New York Times reports that a short-seller of Lululemon Athletica (NASDAQ: LULU) shares suggested that it test its clothes for seaweed content. The result -- 0% -- proved profitable for the short-seller. Lululemon Athletica shares have lost 10% of their value in premarket trading.

Why would the seaweed content of Lululemon Athletica's products affect the value of its stock? Because Lululemon claims that its clothes are 24% seaweed fiber. On being found out, Lululemon CEO Dennis -- call me Chip -- Wilson's comment was priceless: "If you actually put it on and wear it, it is different from cotton. That's my only test of it."

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• Lululemon Athletica Inc (NASDAQ: LULU), a standout performer on Wall Street, is reportedly under fire for potentially false claims of its VitaSea clothing line, which the company says is made from seaweed fiber supplied by SeaCell. According to lab tests, the New York Times reported there was no significant difference in the mineral levels between regular cotton T-shirts and Lululemon's VitaSea fabric.