SETUP
So after the great feeling of triumph and enduring feeling of having broken through some form of repressive conditioning, I'd also been wanting to not only get more thongs and be more open about it (swim and underwear - beach, apartment building, friends, acquaintances, neighbours etc etc) but being able to try on a thong to have it adjusted.
PREMISE (what do these mean anymore anyway?)
I have a handful of swim thongs i.e. specifically for swimming along side "could be maybes." My rio suits would be along that line but I wear them as swim wear only. But one is a custom one I got from buffed bod. It's a great cut from the front by the thong back is a too long for me and won't sit right and looks off when wear it low. I was on the lookout for a tailors where I could get it altered and been looking for one where it would be women and wouldn't be too many other people.
It's been a week or two since I started searching and couldn't find anything; some of them have even closed for business. The ones I could see into and went to only had men or was too busy. Eventually after not having any luck I decided to go the one with the guy, a bit older but in a relatively secluded basement - and after the breakthrough I had today with wearing a thong to the pool today [viewtopic.php?f=7&t=568] I wouldn't have any problem trying it on.
THE SCENE IS SET
But then I thought maybe I could use the local franchise tailors. There's one nearby on the way back home from work and I did notice it was just women in there. The first time it was closed, but then I went back today after my swim session. It was the three women again. The receptionist came over and I asked if they alter swim wear. She had a sheepish grin and said of course, but what kind. I was somewhat hesitant and started saying oh it's here, um it's a swim thong or along those lines and managed to pull it out of my bag and just lay it on the counter.
She was asking what I wanted and I explained how the thong sits too high on me and I want it lower. And I showed that I wanted the thong part shortened. She asked if the front was ok and I said yes. And then said yeah it possible but asked if I would know how much would I want it shortened. I asked if she had a ruler or tape. I kinda laid out a certain length which I decided while I tried on at home and she said it would be from the top and not the middle they would do it and stuck safety pins in to mark the measurement.
I was hoing and humming and said a certain length might be ok but wasn't too sure. At this point I just came and said if It would be ok if I could try it on and show them as I realized otherwise it wouldn't be brought up. She said of course without missing a beat and I said "oh, ok" and went into one of the changing rooms and stripped off my pants and thong and put on the swim thong and adjusted to where I thought I wanted it.
ENTER THE SEAMSTRESS
I opened the door halfway and looked out and no one was there, so I said I'm ready. And one of the ladies working in the back came in and there I was in just a hat and hiked up t-shirt in my swim thong. I had the thong back pinched to have it sit where I wanted. She came in and I turned my back towards her and told her I wanted it like that.
She was on one knee at the point trying to mark the length of fabric need to be removed and was pretty much face first in my thong. I had two mirrors, in front and on the side I could see her from and was either talking to her through that or turned around. And she was pinching it as I was and making adjustments and at one point it was pulled even snugger and I said I'd like it like that.
I turned around and said snug like that and she said if I wanted 2cm more taken off to what I had already pinched. I didn't think too much of it and said yes, I shouldn't have said that much but the suit looked and felt way nicer that way.
So now I will have another thong swimsuit to enjoy in, and all at a great price while getting to play through a scenario I so often wanted. It was very normal, relaxed and my only regret is that I could've live through it in a more engaged way and I turned around to look at my thong directly. It just seemed matter of fact and the kinda thing you read online and imagine it to be all made up. That's kinda how I feel even though it happened. Just a matter of fact thing which should happen but isn't that common.
THONG ON
But that just adds the nicest little extra pie with the best little cherry on top to follow up with my previous experience. After that she left and the door was falling and she was like "oh mind the door."
I got dressed and went out to pay, the cashier started chatting with me and said she will put the item as a "tie" since they didn't have anything else on the system. I just assumed they had no swimwear. But later when I checked the receipt it said: swimwear - tie 
hopefully something similar like that happens and I won't be too worn out from the day to enjoy it to the fullest 