If I looked like any of those girls I would live in my bikini 24/7. But since I weigh about 100-lbs more than they do, I will refrain in public. I find shopping in general to be completely humiliating, to the point that i have spent 20 minutes holed up in a dressing room crying. I tried looking for a bathing suit last year and it was such a crushing experience I just didn't want to live.


I HATE my body. HATE it. I dont' want to look at it and nobody else wants to look at it, thats for dang sure!
Here's my biggest beef with most bathing suits--they leave way too much uncovered. Even the most modest suits are way to low cut--I dont wear anything that shows cleavage. I'm sorry, but at age 55 that ship has SAILED. Why can't someone make a well-fitting suit which doesn't let it all hang out in a size that a queen size woman can wear and not feel like jumping off a bridge? I'm not an enormously morbidly obese woman. I'm probably 30-lbs overweight. But put me in a bathing suit and I swear, I could be a Macy's Thanksgiving Day balloon!
IME Land's End and Miraclesuit sell PLENTY of them; they are not going to be dirt cheap unless you buy at the end of the season, but LE is doing 30% off and free shipping right now, so that's not bad at all. (I even say this as a person who won't wear suits with skirts on them; I don't like fabric flapping around my legs when I swim laps.) There are quite a few sport-type separates with longer bike shorts bottoms at AlwaysForMe.com, and several sites carry the indestructible Penbrooke Signature Crinkle tank suit; which is made of polyester rather than lycra; it's great for lap swimming.
Personally, I like a bit of cleavage; it's the one asset that I've got that is still worth showing off (and it helps just a bit to distract from the rest of me at the same time.) However, if you don't like it, there are plenty of sport suits on the market that are cut high in the neck (try Swim365), or you could go with a retro beach suit sold by a company like Rey Swimwear. Or there is Athleta (part of the Gap stores family), which is a GREAT option for younger women, especially, who want something more athletic and modest, but still fun and colorful. (Athleta can be quite pricey, however, so it's not always the best option for growing girls. An investment swimsuit is more for adult women.) Land's End has a high-necked control suit called the Carmela that they sell in a HUGE range of sizes; I tried it but I felt it was too high-necked for my taste (I'm very busty, so high-necked suits tend to give me a mono-b**b look.)
Suits for people our age and size are out there, you just have to look carefully. What I have done with Land's End is to order 6-8 suits during the 30% off sale and try them all on at home; then I take whatever I don't want back to Sears for an immediate refund. They have absolutely no problem with someone doing that.
One last thing about being older &/or larger and wanting a suit: the key for us is to pick one that is as flattering as possible to the body that you have. Looking truly good may not be a reasonable goal if you are not fit, but looking bad isn't necessary, either. Strive for that middle ground: get a good color, a supportive bustline, and the best hipline that you can, and make sure that any jiggle is as contained as possible; then get out there and PLAY in the water. Once you are submerged up to your chin, no one is going to be able to see the suit anyway, and if you swim long enough, you can only look better in it.
About 5 years ago I asked my DH's opinion of a suit I tried on, and he replied with, "black? again?". I asked him what was wrong with black, and he said that in his opinion, while going conservative in cut was probably wise, he thought that conservative black suits made me look MUCH older. So ... I took a chance and figured that he cares about me enough to give me an honest opinion and went with a color, and another color, and yet another. I haven't owned a black suit since then. I don't go with loud prints, but I now do choose something a bit more festive: of the four suits that I currently rotate, one is purple, one is royal blue, one is a navy/olive paisley with navy trunks, and one is (of all things) IVORY, with a small earth-toned circle pattern on it. All four of them came from Land's End (the paisley one is new; it's this one in a different color:
http://www.landsend.com/pp/womens-b..._MERCH=search-_-paisley+halter&origin=search#
... but I wear it with a pr. of navy boy shorts. (Swimming is my favorite form of exercise, and I'm darned if I'm going to give it up for lack of decent suits -- besides, I've got a 4 yo to chase after, and I'm not about to let her grown up anything like the way I did, with a mother who refused to ever get in the water with me because she was self-conscious about the way she looked and as a consequence couldn't swim a stroke. I bodysurf with my kids, and I'm going to keep doing it until I just absolutely can't hack it anymore, because it's FUN, even if my teen DS leaves me in his wake these days.)
Oh, and PS for the guys:
Ladies, you're not the only ones with bathing suit anxiety, whether trying on in private or wearing in public. I don't know if I look worse before or after I lost a bunch of weight. Before I looked like a walrus with a glandular condition. Afterward, there's so much loose skin that I look like a sharpei with a beard. Which is why I always wear a nice (meaning not flimsy) t-shirt on those rare occasions that I'm forced into a bathing suit.
My DH used to be self-conscious shirtless as well, because he has a strange set of scars on his back from a childhood accident; they look like scars from a flogging. These days he wears a rash guard when he is on the beach or playing with the little one in shallow water. He likes this one from Lands End:
http://www.landsend.com/pp/mens-sho...:UJ5&CM_MERCH=IDX_swimwear-_-men&origin=index (He buys it in his normal shirt size and it is not tight, and the zipper gets rid of that whole turtleneck issue.) They sell that swim shirt for women and kids, too; we all have one, even my teenage son.