Azam,

The NASA TEchnical report server shows 1020 hits for 'spacesuit specifications'.

A great many documents may be of interest to you:

https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740008731.pdf

https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120014266.pdf

(by the remarkable Dennis Jenkins - his work on the STS is a milestone of documentation)

https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19710001702.pdf

and so on

Thanks for your helpful comment