Three types of shirts

• Suit Shirt - A long sleeved garment with a collar that may or may not be worn with a suit.
• Camp shirt — a loose, straight-cut, short sleeved shirt or blouse with a simple placket front-opening and a "camp collar."
• Dress shirt - shirt with a formal (somewhat stiff) collar, a full-length opening at the front from the collar to the hem (usually buttoned), and sleeves with cuffs
• Dinner shirt - a shirt specifically made to be worn with male evening wear, e.g. a black tie or white tie.
• Winchester Shirt - a coloured or striped dress shirt nevertheless with white collar and cuffs.
• guayabera — an embroidered dress shirt with four pockets.
• Poet shirt — a loose-fitting shirt or blouse with full bishop sleeves, usually with large frills on the front and on the cuffs.
• T-shirt — also "tee shirt", a casual shirt without a collar or buttons, made of a stretchy, finely knit fabric, usually cotton, and usually short-sleeved. Originally worn under other shirts, it is now a common shirt for everyday wear in some countries.
• Long-sleeved T-shirt - a t-shirt with long sleeves that extend to cover the arms.
• Ringer T-shirt — tee with a separate piece of fabric sewn on as the collar and sleeve hems
• Halfshirt — a high-hemmed t-shirt
• A-shirt or construction shirt or singlet (in British English) — essentially a sleeveless shirt with large armholes and a large neck hole, often worn by labourers or athletes for increased movability. Sometimes called a "wife beater" when worn without a covering layer.
• camisole — woman's undershirt with narrow straps, or a similar garment worn alone (often with bra). Also referred to as a cami, shelf top, spaghetti straps or strappy top
• tennis shirt, golf shirt, or polo shirt — a pullover soft collar short-sleeved shirt with an abbreviated button placket at the neck and a longer back than front (the "tennis tail").
• rugby shirt — a long-sleeved polo shirt, traditionally of rugged construction in thick cotton or wool, but often softer today
• henley shirt — a collarless polo shirt
• baseball shirt (jersey) — usually distinguished by a three quarters sleeve, team insignia, and flat waistseam
• sweatshirt — long-sleeved athletic shirt of heavier material, with or without hood
• tunic — primitive shirt, distinguished by two-piece construction. Initially a men's garment, is normally seen in modern times being worn by women
• shirtwaist — historically (circa. 1890-1920) a woman's tailored shirt (also called a "tailored waist") cut like a man's dress shirt;^[13] in contemporary usage, a woman's dress cut like a men's dress shirt to the waist, then extended into dress length at the bottom
• nightshirt — often oversized, ruined or inexpensive light cloth undergarment shirt for sleeping.
• sleeveless shirt — A shirt with no sleeves. Contains only neck, bottom hem, body, and sometimes shoulders depending on type. Also referred to as a tank top.
• halter top — a shoulderless, sleeveless garment for women. It is mechanically analogous to an apron with a string around the back of the neck and across the lower back holding it in place.

Tops that would generally not be considered shirts:

• onesie or diaper shirt — a shirt for infants which includes a long back that is wrapped between the legs and buttoned to the front of the shirt
• sweaters — heavy knitted upper garments
• jackets, coats and similar outerwear
• tube top (in American English) or boob tube (in British English) — a shoulderless, sleeveless "tube" that wraps the torso not reaching higher than the armpit, staying in place by elasticity or by a single strap that is attached to the front of the tube source by   http://en.wikipedia.org/wiki/Shirt