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The best advice I could give is tape, problem is bathing suits generally mean water and even medical tape seems not to be all that great at holding on under water.

If I want to tuck things away my version of a low tech gaff is just a very tight pair of panties with a normal sized pair over, feels kinda silly but works alright.

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I had this issue on HRT (normal-sized before, but it shrank down fast). Anything too snug and I had the little "teepee" pointing straight out. Drove me nuts, no pun intended.

I had some good luck with wearing a girdle, as silly as that sounds; it's a little old-ladyish, but the heavily reinforced elastic crotch basically gave me a little "shelf" to rest the goods on top of. Meant my crotch area was a little lower than it would be otherwise, since I didn't pull the girdle up tight (counterintuitively), but if I was wearing a skirt or dress that didn't show, and the actual area was flat and smooth, since that's one thing girdles do for cis women as well. Plus, since I wasn't having to wear extra-tight panties, it was a bit more comfortable than most tucking methods I've heard of (I never actually tried, I admit). Of course, mostly I just dressed in looser pants to conceal the area entirely.  

I have had much the same issues tucking. I've worked out a few things though.

Anything applying pressure from underneath ( panties pulled up tight etc ) will encourage the thing to 'ball up', and kind of point out straight.

Gaffs don't seem to do much for those of us with smaller things.

The two-panty method seems to work best, taking care not to pull them up too tight. And for added protection ( with a tight dress or skirt ), I also use nylons that have a control brief, with the legs cut off. Makes it all kind of snug, but seems to work well.

Of course nothing is full-proof, except SRS.

hmm... well I have a real tiddler, one inch or less when droopy, sometimes almost pops inside me when I'm sitting down. Small balls too. As such I don't have much of a problem tucking and have managed to once wear a swim suit without (apparently) any problem. Sorry, guess I can't offer much in the help department as I'm too small to have the same problem. It really bugged me when I was trying to present as a dude, but I've never been so happy for that "shortcoming" as I am now.

I'm also cursed with a teeny weeny peeny.  I'm only about an inch long,   No way i can stretch it down.
I do a "Scrotum tuck".  I wear tight spandex panties.  I pull up on the scrotum until the testes are in their pockets,
Then I press the penis inward toward the fold in the sack.  The result almost appears like female parts.
I can wear this with leggings, shorts, or skinny jeans with no bulge.

If there is arousal, the vein expands inward and down, without a tell-tale bulge.
It's very comfortable, and easy enough to do that you can do it after each trip to the restroom.

Best way is to buy a small pair of cheap panty hose and cut the legs off below the re-enforced tops, pull them up tight so that they are going up the crack of your arse and put a size smaller than normal panties on over them and pull them up tight, you should have a flying W appearing crotch. I have a dinky dink and no balls and this works well for me.

If you haven't tried taping you should give it a try at least once.  The method I'm partial to is a Japanese-style Tucking.  I'm not sure if that is the actual name but it's the only name I've heard it referenced as.  I use 3M Micropore medical tape and it holds up well to both showers and swimming.  I'l give you a TMI warning and try to describe it.

First of all, I make sure everything is well shaved down there. Having tape pulling on your short hairs can make moving pretty painful.
Next I take some 3" tape and cut 3 - 1/2" strips and 2 - 3"x3" strips.  I also cut a 1/4" hole in one of the 3x3 tape strips.
After tucking the twins inside I pull the penis downwards. Starting from the top I then pinch the loose flesh on either side of the genitals together over the top of the penis and use the 1/2" strips to hold it in place. Eventually everything is hidden inside with just the tip of the urethra showing at the bottom.  When everything is positioned I place one of the 3x3 strips over the top to hold everything together. Using the second 3x3 strip with the 1/4" hole, I place the hole over the opening of the urethra and tape the bottom of everything in place. 

I love this method because, since I'm not overly large I can tuck everything inside and still use the restroom.  It's also comfortable enough that I've slept with it on.

The only caution I'd give you is to keep some baby oil handy for when you need to get it off.  The tape I use doesn't seem sticky at first, but after it's been on for an hour it's thoroughly attached.  You'll need to really soak or use some oil to coax it back off.  Just remember to be gentle.

I first came across this method in a japanese Manga, "Daiwari to josou to assistant".  Copies are easy to find if you google it.  The manga shows the basics of how it's done but you may have to experiment a bit like I did before you are happy with the results.

Anyhow, I don't know if this would work for everyone but it works for me and I love the way it looks.

I'm loving the euphemisms here... tiddler, teeny weeny peeny, dinky dink...

Well at least you don't have a Dirk Diggler.

FWIW, one piece swim suits can be had with a 'slimming skirt' which is short but would help hide any small bulge, especially if you use darker colors like black or navy.

I 2nd tight panties or a tight thong style body shaper. Simply tuck the wing wang and your good to go.   Tape never worked for me unless I taped everything... 

For those who have erection issues. Buy a small cage to wear and that wont be a problem for long. 

Quote from: Ms Grace on January 25, 2014, 07:23:55 PM
I'm loving the euphemisms here... tiddler, teeny weeny peeny, dinky dink...

And now wing wang! 

Quote from: Shantel on January 26, 2014, 10:42:55 AM
And now wing wang! 

I had to add to the list

Now lets see who will use pa-donka donk next. lol 

Quote from: Natallie553 on January 26, 2014, 10:46:49 AM
I had to add to the list

Now lets see who will use pa-donka donk next. lol 

No doubt Ms Grace will be writing some humorous little book about all of the descriptive names for dangling modifiers. Just looking at her fabulous smile is an indication of an underlying impish personality. 

Mr. Happy.  Although that may be more of an individual name...