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If you can tolerate wool, take a look at Uniqlo’s merino turtleneck. The ribbed knit allows a snug fit and they are nice and long. I size up, as I find them slim fitting and can shrink a bit over time.
The one thing I learned from What Not to Wear was to give knits a strong snappy stretch if they feel tight anywhere. It has helped with tight T- necks. Stretching probably will have to be repeated after washing or even dry cleaning. Feeling like you are being choked is not good. Good luck.