Some people have sensitive skin so a rough kind of material is most likey to make them itch. I myself gey an itch from those kind of coats, cardigans etc..... Did you try on the coat before you bought it? If not then you should buy a diffrent coat that doesnt have a material likeyour old one.
It's probably the fabric. I can't wear wool because I find it so itchy. There isn't really anything you can do apart from trying a long-sleeved T-shirt underneath, but that isn't always enough for me.
It is either
a) the material
b) the dye in the material.
Either way, you're allergic and there really isn't anything you can do. Take it back
Don't wear the coat. Simples.
30% wool, 30% acrylic, 40% polyester
thats what its made of- found it on website
whe wool is mixed with acrylic, it often is very itchy.
i just want to know why NOW you've bought a coat, i mean the weather is improving everyday now so really theres little need for one this time of year.