Well I have just purchased a collarless shirt from L M Lewin, so I'll let you know how I get on.
At £30, I though it was worth a punt
http://www.tmlewin.co.uk/Regular-Fit-Plain-White-Poplin-Tunic-Shirt/34097,en_GB,pd.html?start=1&cgid=Mens-Shirts&prefn1=collarShape&prefv1=Tunic
At £30, I though it was worth a punt
![34097_original_original.jpg](http://demandware.edgesuite.net/sits_pod23/dw/image/v2/AAEX_PRD/on/demandware.static/Sites-tmlgbp-Site/Sites-tml-catalog-en/en_GB/v1377853305817/images/original/34097_original_original.jpg?sw=140&sh=170&sfrm=jpg)
http://www.tmlewin.co.uk/Regular-Fit-Plain-White-Poplin-Tunic-Shirt/34097,en_GB,pd.html?start=1&cgid=Mens-Shirts&prefn1=collarShape&prefv1=Tunic