I am not sure if you are speaking of Gulliver's appearance or the appearance of Lilliput, so I will speak to both.
In Part One, Gulliver has become shipwrecked. He washes up on the shores of Lilliput. Understandably, he is dishelved, wet, and having been at sea some time, a bit smelly. His longish hair is pinned down as he restrained by the Lilliputians. He has managed to hang on to his "buff jerkin" (tan jacket) and his spectacles.
There are many short descriptions of Lilliput in Chapter One, but the reader sees it more clearly as the narrator sees it at the beginning of Chapter Two:
The country round appeared like a continued garden, and the enclosed fields, which were generally forty foot square, resembled so many bed of flowers. These fields were intermingled with wood of half a stang, and the tallest trees, as I could judge, appeared to be seven foot high. I view the town on my left hand, which looked like the painted scene of a city in a theatre.