The default barrier jacket of Fate Testarossa used from Lyrical Nanoha's first TV series to A's until upgrade.
It is similar to Lightning Form and Movie 1st ver. The main features are her Thighhighs with flat tops and red Thighhigh Belt, hand gloves without armor, etc.
In order to make it easier to search for the original version, please use Lightning Form if the features are not obvious and difficult to distinguish.