Itchy serger seams. Help wanted.

Serged blouse seams cause me to be itchy - for years. I have tried a tank under blouses turned inside out and blouse/tee seams out. NOT CLASSY. Still itchy. My purchased sweaters with serged seams also itch.
I made one very soft knit blouse - no itch. Cannot find same fabric. My online you tube search ideas - Have Not tried Yet.
1. Lining 2. Cotton covered poly thread. 3. Open seams sewn down 4. Flat felled seams. 5. French seams.
Any Ideas or Suggestions welcomed.

I have the same problem so in my house I wear many things inside out! Fortunately I have few people dropping by unexpectedly.

I think your solution will depend on the reason for the itch. For me it is anything rough and bumpy in the seam, like labels or lumpy seams.

Another thing for you to try might be wooly nylon thread in your serger. It usually feels pretty soft.

When I sew knit tshirts, I do not finish the seams at all. You have to check the fabric to see if it is stable enough, but many knits are fine and will not unravel. A nice soft combed cotton tshirt with unfinished seams....aaahhhh, no itch.
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Is it the fabric or the seams that itch most? I'm working mostly with cotton fabric. I get the least itch with silk thread (Guetermann) or 100% cotton thread (Aurifil). Both will also work in a serger. Most garment projects don't need miles of serged seams, so that's not an issue for me. I just buy extra thread or wind up some extra bobbins to use on the serger.
Overcasting seam allowances by hand, using silk thread is also an option. This requires a bit of muscle memory in the fingers, but once you get into it, it won't really take that long on a little blouse. Use a thread conditioner (like Thread Magic) to get less tangles while hand-stitching.
When choosing a pattern, look for construction details that don't have exposed seam allowances on tricky areas, like collars. The fold-under and slip-stitch kind isn't very popular on this site, but the tiny slipstitches hide well in the ditch, and they won't scratch.
-- Edited on 12/16/19 at 10:03 AM --

If it was just one or two favorite store bought blouses with serged seams that did that to you, you could probably cover all that serging on the seams (of inside of woven blouse) with some other fabric "binding" over it. After the fact. It would be kind of a large project for each store bought blouse though. But if you sewed that on, totally by machine, it might do the same thing even. If you machine sewed it on on just one side, then flipped it over to cover that overlocking, and that machine stitching, then slip stitched by hand the other side down, then optimally, it would feel more soft and flex-able than all machine stitching, as hand stitching is just or can be just like that. What a lot of work though, that would be. If you wanted to do that to everything you wear that you bought anyplace.

There are french seams in some woven blouses in the stores, but unfortunate not usually the very cheapest or reasonable priced ones and only the more expensive kind of ones most times. You just have to check everything on the hanger before you even buy it. But it would probably be better to have fewer even expensive made clothes (picked out on purpose for that) that you would actually wear, than more with serging in them, that you would not wear after purchase.

I think if sewing stuff for yourself, then just don't have any serger seams in them at all, if it bugs you. It could be, even plain straight stitched seams with unfinished raw fabric edges might bother you too- as how would you know unless you tried it first each time? I think you would just have to try it and see even.

Thank you So Much for these ideas about itchy serger seams. The underarm sleeve seams that interest are the worst for me on store bought items. I appreciate comments about using binding to cover store bought serger seams. I am going to try using self made thin knit binding because it is soft as one of you explained sewing one side by machine and hand sewing the other. I don’t sew serger seams. I make blouses mostly. I will try French seams and using threads mentioned.
I saw a great you tube on how to put in sleeves with a French seam and one on how to line a sleeve. I might try that also.
😊 READY to try these ideas. I just joined this site and happy I did.