My wife recently told me her two examplars for men's attire were her sainted first husband (who passed into the Great Beyond about five years before I met her) and her father. I don't know anything out her first husband's sartorial taste (although I have the sense that it was lackluster). Her father is an ultra-Trad, clad largely by Brooks and "J. Squeeze," as he likes to call them. He comes by it naturally. He was raised and educated at Phillips Exter, where his father was a legendary master--served about 35 years there. He then went Harvard (Class of '40). My wife likes the conservative aspects of Trad. If I dress like a New England prep school master in autumn, she loves it. The jauntier aspects of Trad she would loathe--if I appeared in a patch Madras sport coat, it might spell the end of our marriage!
Anything redolent of masculine panache or dandyism, she dislikes intensely: pocket squares, white bucks, spectator shoes, hats, ascots and bowties, to name some.
I would never have her along when making a significant sartorial purchase these days. However, when we are shopping together at places where quality menswear is sold--Saks, Barneys, N-M, Polo, etc., I do like to query her about what she likes. I don't want invest a substantial amount in a garment and not have her want to be seen with me in it, but beyond that I want to be skipper of my own ship in these matters.