How to convince my wife?

First off... I hope this doesn't come off like some kind of dick post.. or repeated post as I've read a little similar post here just recently. It's not intended to be at all.

My wife and I have been married for just over 8 years now, together for 14. I'd say we have a pretty awesome relationship - we're best friends basically. We occasionally have a disagreement, but these are really rare. We are financially stable, we always got time for our kids and ourselves despite the hectic schedule. we go on a date atleast 2x/ a week, i.e. a breakfast before going to work or late fancy dinner without the kids.

Either way.. let's talk about my matter at hand. I wish my wife would wear sexy lingerie a little more often. Maybe once in 3 months she will surprise me and she'll put on a tedy or a babydoll that I've picked up for her over the years but those times that she surprised mostly comes with an occasion OR If she ever wear Lingerie with no occasion or out of nothing, that is because of my request or I begged. I've been doing a lot of things for her like backrubs, massage, wash the dishes and I cook for her and the kids daily because I'm the better cook compared to her. Most of the time the subject is just never broached.
we are at our early 30's, with 2 kids, we are not perfect physically but we are fit and are not overweight. So there's no body issues or self confidence probs.

She knows I love lingerie - I'm a sucker for thongs, strings, lace and pair it up with stockings and heels then I'll be in heaven! I'm the type of guy that like to slowly remove the clothing while making love, or I like to have sex with semi naked, a little shirt on or undies on the knees or half of the bra off, skirt up, string pulled etc..

Of course I've mentioned my affinity for lingerie before and I've bought her countless items - I used to buy her some lingerie for every holiday, on top of any other gifts I'd get her. In recognition also, she's bought thongs and strings by herself in which she never/rarely did during our early stages together (includes dating years).
The times she wears Lingerie, are times when we are about to have sex, say we go on a date, she will wear something nice but will just wear regular undies, not the granny type but not thong or strings, then when we go back to our room or say hotel if we are on a vacation, she'll undress and wear the thongs/strings. I mean why not wear it along with the nice sexy dress?
I've told her that if one night we went out she wore a dress or skirt and gave me a surprise peek of stockings and a garter belt underneath, I'd probably lose it right on the spot. Still nothing. Another time we were at the mall and I whispered to her to go pick out some shoes that she thought might be appropriate for the bedroom - We had fun picking them out but she's worn them maybe two or three times in a year.
We have talked about this multiple times, I've even pointed out to her about her co-workers, my co workers wearing thong (in a candid way of course) and her reply is that she's aware of it and that scrub suite really matches well with thongs but she does not want her patients attention on her in which I totally agree. so it is not like she does not want to wear thongs coz she does, like when she exercise in our mini gym at our basement she wears thongs (not all the time) not that frequent and also she make sure that if she wears thongs/strings it is not visible to someone like jeans and strings. Like the other day, when we gave the kids a ride to school, she was wearing leggings but she put a skirt on top (IDK how to describe it specifically) then when I dropped her back at home, when she went out of the car, I playfully squeeze her but then I noticed she was wearing a thong then I told her how sexy she was and I appreciate it then I told her that I was so turn on, but she just dismissed me and told me, later because we were running late, I pretended to took of while she went inside the house then when I went inside to catch her, she already changed undies, although we end up having a quickie, same situation occurred. Most of the time I get a reasoning, why wear it when it'll be removed anyways.

I am hoping that a women especially wives can tell me about their opinions on lingerie or thongs and how they feel if they are wearing thongs that are clearly visible say white skirt and black thong? Does your husband prevent you or will tell you it's to obvious? for me, while it's a big turn for guys to look at my wife, there's also a little conservative side in me that will tell her it's too much but it does not happen and my request for her to wear thongs happens mostly at nights, on a movie date, late night dinner at a fancy restaurants with rich guys, some olds with younger wife or GF's that got far more revealing items than my request to my wife so for sure it'll be just normal for those guys and no high testosterone teens around or there's only few of them.

Believe me, this isn't a make it or break it type of issue. It would just be the sprinkles on top of an already ginormous, delicious, hot fudge sundae. I'm sure I missed a few points, but I think you all get the general idea.

Any ideas, or am I just SOL?