I never had enough pockets, so I used an old ruck, no frame. It also made a fair seat or pillow. I found one that was fairly smooth on the outside so it didn't get caught on the brush.
BUT,, if you are looking for a vest, take a peak at the old Medic vests at your local army/navy store.
The US aviators vest CMU-33 is all molle, front & back, customize as required.
http://www.ebay.com/itm/US-Army-Avia...item4d2e77b22a
or the older USA molle vest:
http://www.ebay.com/itm/MOLLE-Medic-...item2ede51af87
The Brits were late to the molle centric trend and made some nice gear:
http://www.ebay.com/itm/RARE-2000S-U...item417dc644be
The did a nice molle vest after a while:
http://www.ebay.com/itm/MLCE-MTP-MUL...item462931caeb
And the ruskies
http://www.ebay.com/itm/russian-army...item2344227d36
Arktis makes some nice Brit kit
http://www.ebay.com/sch/i.html?_odkw...Text=&_sacat=1
PS: I used ebay for ease of search, this gear may be found at better prices on the net..