Who is "he"?
I do like a narrower tie for a repp. The stripes, depending on color and spacing., can make it appear wider.
My 8,5 cm (standard for me) striped shantung is my favourite for this time of the year. I don't think it looks wide at all.
Well, Mr. Hober, of course you are the expert, but it seems to me that 8,5 cm (the width of the tie on my picture) is a bit less than 3,5 inch. It is true, however, that the way I tied it (it's a 4-in-hand with the narrower end peeking out on the side) may make it appear wider.
I am not thin (well, you got the picture; for proportion: I'm 183 cm tall, which is a tiny bit under 6"1) and I think 8.5 cm is just perfect for me.
You are absolutely right wrt. to the narrow end; I always liked the look and found it cool, but definitely not for formal attire. But that day I just felt like wearing it, and the landscape and weather were with me on that point :).
It was also to make a point that striped shantung, even in standard width, is a perfect choice for summer in semi-formal or casual context.
If the only thing holding you back is not seeing the tie pictured with a suit, you should buy the tie. It will go well with any solid grey or navy suit. I suggest wearing it with a pale blue shirt.
If you enjoy the world of ties I invite you to visit my site- www.chippneckwear.com. I offer quality at very competitive cost. For example, my Ancient Madder ties are made using the same Ancient Madder silk from the same English mill that Drakes uses for their Ancient Madder ties. My price is $67.50
Winston Tailors/ www.chippneckwear.com