Hi all, big thanks for all the suggestions for this top.
In the end I did the neckline with 2 inch bias stripes stitched on the wrong side and folded to the front and top stitched, and also on the sleeves added 3 inch bias bands sewn on the right side and pressed open. The hem I did on the coverstitch.
So now I have a crinkle woven T - shirt suitable for a really warm day.
It's in the wash getting re-crinkled at the moment but I will add a photo during the next few days.