Check out some commonly used terms in relation to Pantyhose & Nylon Fetishses:

Cuban heel - A stocking with a heel made with folded over and sewn reinforcement. 

Demi-toe - Stockings which have a reinforced toe with half the coverage on top as on the bottom. This results in a reinforcement that covers only the tip of the toes as opposed to the whole toe. These can be with or without a reinforced heel.
Denier - The lower the denier number the sheerer the garment. Stockings knitted with a higher denier tend to be less sheer but more durable.
Fishnet - Knitted stockings with a very wide open knit resembling a fish net.
Fencenet - Similar to fishnet, but with a much wider pattern. These are sometimes worn over another pair of stockings or pantyhose, such as matte or opaque, with a contrasting colour.
Full-Fashioned - Full-fashioned stockings are knitted flat, the material is then cut and the two sides are then united by a seam up the back. Full-fashioned stockings were the most popular style until the 1960s.
Hold-ups or Stay-ups - Stockings that are held up by sewn-in elasticated bands (quite often a wide lace top band).
Matte - Stockings which have a dull or non-lustre finish.
Mock seam - A false seam sewn into the back of a seamless stocking.
Nude heel - Stockings without reinforcement in the heel area.
Opaque - Stockings made of yarn which give them a heavier appearance (usually 40 denier or greater).
RHT - Abbreviation of reinforced heel and toe.
Open-toed - Stockings that stop at the base of the toe with a piece that goes between the first and second toes to hold them down. They can be worn with some open-toed shoes, especially to show off pedicured toes.
Sandalfoot - Stockings with a nude toe, meaning no heavier yarn in the toe than is in the leg.
Seamed - Stockings manufactured in the old Full-Fashioned manner with a seam running up the back of the leg. In the past they were manufactured by cutting the fabric and then sewing it together. Today stockings are generally fully knitted and a fake or mock seam is added up the back for a particular fashion look.
Seamless - Stockings knit in one operation on circular machines (one continuous operation) so that no seaming is required up the back.
Sheers - Stockings generally of a 15 to 20 denier.
Knee-Highs - Stockings that terminate at or just barely below the knee.
Thigh-Highs - Stockings that terminate somewhere in the mid-thigh.
Ultra Sheer - A fine denier fiber which gives the ultimate in sheerness. Usually 10 denier.
Welt - A fabric knitted separately and machine-sewn to the top of a stocking. Knit in a heavier denier yarn and folded double to give strength for supporter fastening.

Did you know that In the 1920s the fashionable hemline for women's skirts and dresses began to rise enough to show a woman's legs and sheer hosiery that covered the legs was only available as stockings. They were typically made of silk or artificial silk (now known as rayon), and after 1939 with nylon.
In 1959, Allen Gant Sr. of Glen Raven Mills introduced pantyhose. Stocking manufacturers began using circular knitting machines to reduce manual labor and create seam-free stockings. In 1965, Glen Raven Mills introduced a seam-free version of pantyhose, which coincided with the introduction of the miniskirt. The miniskirt made it unfashionable to show the tops of a woman's stockings, and by the end of the decade pantyhose had replaced stockings almost entirely. This also contributed to a marked shift in foundation undergarment sales: younger women stopped buying girdles around this time. In the same period hosiery started adding spandex or elastane to give it stretch superior to crimping nylon. Glen Raven Mills still operates in North Carolina, U.S. as Glen Raven Inc.

In addition, Pantyhose are available in a wide range of popular styles. The sheerness of the garment, expressed as a numerical 'denier'/'dtex', ranges from 3 (extremely rare, very thin, barely visible) to 15 (standard sheer) up to 30 (semi opaque) until 70 (opaque).
For people who want a slimmer form, they may opt to get "Control Top", which has a reinforced panty. The downside to Control Top Pantyhose are the panty lines that may appear when wearing high cut skirts or shorts. Sheer to Waist is just that - sheer from the toe to the waist - no panty lines. Perfect for high slit gowns, mini-skirts and when wearing with lingerie.
Pantyhose occupy very little space when not worn.
Also for the person who wants a bit more support on the top half, there are pantyhose that have panel gussets incorporated into them. These are either single or double types. In the single type, there are two seams instead of the usual one, with a single one on the opposite side; with double panel gussets, there are two seams on either side. The single type can be worn either way. They both help to expand the top panty area. There are also types of pantyhose which have a lacy panty area which is normally floral in design. (citation needed) Many pantyhose brands now produce pantyhose that do away with seams completely, so that the outline is smooth from top to bottom.