I have a brand new, ginger tweed, Nigel Cabourn wide lapel jacket in size 48 for sale. This is from Fall/Winter 2013.
It has functional sleeve buttons, silk lined sleeves, and a nice think tweed fabric. Good for colder weather. The little pin thing on the lapel is removable, if it's not your style.
I think this fits about the same as a Mallory in 48. If you are a Suitsupply 38 (in the Sienna or other standard fits), it will work for you.
Feel free to ask any questions...