Try www.ujena.com for sheer one piece or www.rosegal.com you may have to cut out crotch liner.
Ujena is higher quality but you can get 6 from rosegal just be sure to get unlined versions.

the wife
 

I have shared this it another thread but fits perfect here. When when lived in Florida my wife had to have a new swimsuit so we went shopping and she picked out a white one piece playboy suit. When she showed it to me I told her would be see through and she replied it is lined so it wouldn't be. We bought it and left. A male friend of ours joined us on a trip to coco beach were she got it wet for the first time and guess what happened, it became as transparent as a piece of glass, nothing left to the imagination. Our friend didn't didn't know what to do and swam away from us a bit. When we went over and joined him he figured out I didn't care at that point and enjoyed the situation. She would ride a wave then walk back up onto the shallow sand bar we were on keeping the suit wet but fully exposing everything up close to our friend. Finally when a group of guys gathered on the beach to watch her I told her I was right about the suit being see through.

the wife...
 

What was her reaction to finding the suit see through? Does not seem like it bothered her much if at all that day! :D Did she wear the suit again?

Does she have a similar suit now? If not - you should get her one or maybe several!! Some guys have cut out the lining of their wives' suits. Never understood how a woman would not notice that and go ballistic over "ruining" one of the suits but hey, if it works... :)

her response
 

She was not happy I didn't tell her for such a long time. She wore it to lay out but never swam in it again. I bought her a new one a few years ago as a birthday present for myself, she wore it once in our pool with just the 2 of us.

Friends of ours visited Cape Cod years ago. She is from South Africa and she wore a white suite. I didn't look much but I could see her nipples pretty well.

At some point I'll get my wife to wear a suit that's unlined at some point so I can see her nipples through it.

Breaking through that barrier can takes years of gentle encouragement to overcome years of "conditioning." Have been down that road and it is slow going. Is a year round effort of subtle compliments and suggesting more risque clothing when shopping with the wife, and buying some items you know she would look great in and ask her to wear them for special occassions, both at home and going out. Baby steps seems to be the best way...

Agree
 

I agree....it took me 10 years to finally get my wife to let her hair down and forget about what society tells her she should be and should wear.
Once she did....WOW....hang on tight, what a ride. We are going on a cruise in a couple weeks and we intend on filling up the cards in our camera with mostly pics of her and a few videos of us going at it. When we get back I'll definitely post a few new pics here for everyone to enjoy. But, at any rate, gentle persuasion and confidence reinforcement is definitely the best way to get her where you and she(even though she doesn't know it) want her to be. Good luck and have patience.

My wife
 

that boundary went sky high when she found out I liked watching guys looking down her top and seeing her braless tits.

my wife
 

It took sometime but she warmed up to going to the nude beach. 1st she would only go topless and I said if a guy walks by or starts talking to her not to run and cover up her boobs. So she was a trooper and talked to a few guys with her tits out.

Now she goes nude and has had guys cone by to check her out only to see her pussy up close. Had one guy snap a few pics of and he would focus on her pussy zooming in.

Now I need her to be the one to chat with guys and comment on their cock size etc...

Check Wicked Weasel bikini's

https://www.wickedweasel.com/en-us

They have a lot of sheer and large hole mesh