Before this incarnation I owned both a Uniqlo silk shirt and a H&M premium silk shirt, both great value for money and good, classic fit but unfortunately succumbed to the every day rigours. Uniqlo now only do a silk touch shirt, which is a Rayon and Polyester mix, great if it's an easy care option you're after, and at £24.90 you could treat yourself to a couple of colours, however you can't quite beat the feel of 100% silk.
H&M Premium still do a 100% mulberry silk shirt but currently not available in black!