We finally got FI's outfit while on a wedding shopping trip to St. John's. Every place we went said that their summer stock will be out in a few weeks - too bad we weren't going to be there in a few weeks:)
Anyways, we did have some luck and went to a men's shop (Byrons for those in SJ), they had some last summer stuff tucked away. The pants are a khaki thin wool (which is actually really light weight and breathable, great option for those who don't want linen), they were originally $255 and on sale for $85! We also got his tie there, originally $125 on sale for $55! We did have trouble finding an offwhite shirt but finally found the shirt and belt at Moores. Shoes came from Spring.
In the end I am really impressed with FI. First he said he wanted to go real casual but once he got into shopping he realized he wanted to something a little more "spiffy" and picked out a great outfit. I will post a picture of the full outfit soon