I'm 5ft7 and typically wear a 39-40S jacket. My preference for awhile has been 3.5 inches. I used to get the default width of 3.75 and still happily wear those ties, but I prefer something a bit slimmer. Personally, I think 3.5 is as slim as I'd like a tie to be on me.
Same jacket size and height. Started buying 3.5 and now have slimmed down to 3 3/8.