"Instagram, Pinterest and YouTube have pushed modest fashion -- a term used to describe less-revealing clothing -- into mainstream consciousness. It's a market looking to reap the benefits of Muslims' spending power on clothing, which is expected to increase from $270 billion in 2017 to $361 billion by 2023, according to the State of the Global Islamic Economy." I write about this in Hashtag Islam. There's a reference to a recent exhibition on Contemporary Muslim Fashions held at DeYoung Museum, San Francisco.