So, I couldn't find comfortable and flexible turtle neck and something for inner that is like bodysuit for my 18 months toddler anywhere in store or online. After searching alot i saw this website.
Articles were amazing. Turtle neck comes with button on shoulder so you don't havebto struggle with your baby and is like body suit so it covers my son properly, I don't have to worry more about his back and tummy not covered properly. Similarly those vests are also like body suit, you could get these easily in summer material or for 12 months baby but finding this thing in 18 to 24 months size was hectic.
I love those products, soft, flexibile, comfy and warm.awesome quality.