I own two of these currently (grey and brown) and only the grey fits kin of. The brown is oversized for some reason and definitely looks like it was made for a girls (to tuck all the hair in). Basically, it isn't unisex. Also, the reason it slouches is because it is knitted and very thin . Cold air whistles right through.

In the end, this is the only beanie I have found that slouches, so hurray for that.