I decided to be Walter White from Breaking Bad for Halloween.  When I shave my head I look almost identical to him (but with MUCh less wrinkling!).  I wanted to get the full effect so needed his pork pie hat.

I looked at a few different versions on Amazon but decided on this one in the end.  Others seemed cheaply made or didn't have the same look/shape as what I needed.  Needless to say, I was very happy with my purchase.

The hat (after I removed the feather!) looks very similar to the one he wears in the show.  It is very high quality material and has definite weight to it as opposed to being a cheap copy.  This hat is one that is made to be worn on a regular basis.

As for sizing, I wear the largest size hat in other hats and this one fit me nicely.  If you have a small head it might be a bit big.

Overall a great purchase whether using it for a costume or as an everyday wearer!