High-shine is any leg wear that is very shiny, including wet look items. This is for making your legs very noticeable and to attract attention to your outfit high gloss and other similar terminology. These are items that end at the ankle, leaving the foot free.
Roman numeric system. The numbers 1 to 10 are usually expressed in Roman numerals as follows: Numbers are formed by combining symbols and adding the values, so II is two (two ones) and XIII is thirteen (a ten and three ones).
The big differences between Roman and Arabic numerals (the ones we use today) are that Romans didn't have a symbol for zero, and that numeral placement within a number can sometimes indicate subtraction rather than addition. I. The easiest way to note down a number is to make that many marks - little I's. Thus I means 1, II means 2, III means 3. However, four strokes seemed like too many.... So the Romans moved on to the symbol for 5 - V. Placing I in front of the V  or placing any smaller number in front of any larger number  indicates subtraction. So IV means 4.