Please try this (although a little maybe there are better solutions):
$ pip list | xargs pip show | grep -E 'Location:|Name:' | cut -d ' ' -f 2 | paste -d ' ' - - | awk '{print $2 "/" tolower($1)}' | xargs du -sh 2> /dev/null
the output should look like this:
80K /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/blinker
3.8M /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/docutils
296K /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/ecdsa
340K /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/execnet
564K /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/fabric
1.4M /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/flask
316K /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/httplib2
1.9M /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages/jinja2
...
, Location/Name. ( pip show <package>)
pip show <package> :
---
Metadata-Version: 2.0
Name: Flask
Version: 0.10.1
Summary: A microframework based on Werkzeug, Jinja2 and good intentions
Home-page: http://github.com/mitsuhiko/flask/
Author: Armin Ronacher
Author-email: armin.ronacher@active-4.com
License: BSD
Location: /home/lord63/.pyenv/versions/2.7.11/envs/py2/lib/python2.7/site-packages
Requires: itsdangerous, Werkzeug, Jinja2
Name Location , , , du -sh .