Collared tops for drysuit undies

I'm getting a drysuit soon and since I already have a ton of very warm undergarments that layer nicely for extremely cold weather I am not going to buy and pre-made super undies. I have several fleece tops but the problem is they all have collars of some sort. does anyone have a problem with a collar getting in the way of a neck seal? I can fold the collars under but it makes kind of a lumpy ring around the bottom of my neck tht I'm also afraid will get in the way of the neck seal.

I wear a turtle neck polypro thermal under my fleece or sweats and it never caused any problem.