I bought this costume in "infant" size for my son who will be just shy of a year on Halloween. He is also on the skinny side, but average height. The infant size fit him very well (at current 10.5 months old) and I believe it will fit even better in a month. As someone said previously, the material isn't super high quality, but this is a Halloween costume, what did you expect? It seems to be exactly the kind of material and quality I would expect for a costume and I was not disappointed. The hand pieces (which are attached to the body) are not gloves, but strap on top of each hand. It seems likely I will have to adjust them quite a bit on a squirmy one year old, but shouldn't be too much of a hassle. The head piece is the only reason I am not giving this 5 stars because in the picture the spikes are shown straight up, but they actually lean quite a bit and I haven't been able to really get them positioned well yet. Excited to take my son out for his first Halloween in this!