The Good:

The shirt is great. The colours are authentic and people will instantly remember where they've seen those stripes before. The material is stretchy and fits well and comfortably over a white t-shirt (which I recommend wearing underneath for comfort). Arm length is good, as is the shirt length (untucked) for me being 5'11".

The headpiece is an authentic view of Bert, with the classic eyebrow and hair. The eye holes are easy to see out of, with the caveat below.

The Not So Good:

Be aware that the promotional image used is misleading - there are no green pants with this costume. This is just a warning in case you look at the image and don't realise that it's not actually part of the costume.

The headpiece is difficult to manage and shape. The costume ships flat, which means that the headpiece is flattened and needs to be shaped before using. The hair does not stay up well and flops down in the front, as does the entire headpiece. I had to keep pushing it back up on my head because there isn't anything to keep it upright. This was the most difficult aspect of the costume because the headpiece just won't stay upright and there doesn't seem to be a way to fix that.

I could never get the "flatness" out of it, so from the side the head looks bad. From the front it's more tolerable.

Overall I'm giving it 3 stars for being an authentic design, but with functionality flaws that prevent "good" use.