The victim, a 15-year-old girl, was walking along Folkestone Road away from the town centre at 4.10pm on Wednesday 27 February 2013 when she noticed a man walking in the opposite direction a few feet in front of her.
He touched her as he walked past and then carried on walking.
The incident took place close to the Blue Bells Guest House.
The suspect is described as white, aged 20 to 30, around 6ft to 6ft 2in tall, with short dark brown hair which was spikey on top and shaved at the sides. He had thick eyebrows and thick sideburns and was clean shaven but had either spots or a shaving rash.
He was wearing a navy blue sweatshirt and a grubby pair of Nike Airmax trainers and his breath smelt strongly of alcohol.
Anyone who recognises the suspect or has information is asked to contact PC Kelly Boyd on 101 quoting crime reference ZY/5871/13.
Alternatively, if you have information but would prefer to remain anonymous call Kent Crimestoppers on 0800 555 111.
