All of the following information has been taken directly from Mintel.

"Mintel estimates that consumer spending on underwear, nightwear and loungewear has grown 18.8% during the last five years, with spending expected to reach almost £4.6 billion in 2018."

"Mintel forecasts that growth in this market will remain stable in the next five years, with consumer spending expected to reach £5.5 billion by 2023, representing 19.1% growth."

"Womenswear continues to dominate the UK underwear, nightwear and loungewear market, accounting for approximately 70.2% of total spending."

In the uk, the biggest underwear retailer is M&S.

"Despite ongoing negative publicity surrounding Victoria’s Secret, with many critics stating that the retailer is out of touch with what modern women want from a lingerie brand, Mintel’s brand research shows that UK consumers remain receptive to the brand. Although the brand falls behind brands like Triumph, Sloggi and Calvin Klein in terms of trust, it is strongly associated with being fun, stylish and trend setting. Furthermore, some 28% of consumers that have heard of Victoria’s Secret say that it is a brand that makes them feel more confident – the highest response across all of the brands included within this survey."