@Ben_Soc91
Despite your odd belief that only married men can understand this, I'm going to answer anyways because it doesn't take being married to feel that way.
I know the pants you're talking about and I see them all over the place, even on TV.
One thing I've learned is not many Christian's believe in modesty anymore. A good portion of them (particularly women) actually feel they hold Zero responsibility if anything they say, do or wear causes lust.
Despite what the bible says they insist it is 100% the man's responsibility to resist and they are free to do as they please.
It's very much a secular attitude we see, morphed into the church version.
Also many tend to follow current trends, such as your wife is doing. Then they cite "comfort" as to why they wear things. Somehow comfort also means reveling their bodies?
I can understand the jealousy it provokes since even when dating I didn't want who I was with revealing much. And those pants would certainly cause an issue with me.
And, I'd say, by her not simply seeing it bothers you and respecting your wishes and not wanting to cause a problem, is also a telling sign.
Sometimes approach can affect it though. If you got upset and argued it probably won't be effective. If you haven't already sit down with her and share how it makes you feel and why. Do it without demands or accusations or finger pointing. If she doesn't agree ask her to continue thinking on what you said and end it all on a positive note. Sometimes people may need time to process and may not respond well to being pushed.