Secondhand luxury brand retailer, The RealReal (NASDAQ:REAL), had a very positive public debut. REAL stock soared to $28 on the first day of trading, well above the IPO price of $20.Shares have since gone through a digestion period this week and trade closer to the $25 mark. The hype has faded, providing investors an attractive entry point into a company that plays in a massively growing secondhand clothing market. According to a GlobalData Retail research report, this industry is expected to double from $28 billion today to $51 billion by 2023.