If one is carying two ALICE-type pouches on either side of the pistol belt, a better mode is to use a loop of 550 cord between the two pouches on one side of the belt, and another loop of 550 cord  (replacing the metal shap hook (clip)) connecting the pouch-loop to the harness.  One can use outdoor-rated wire-ties instead of 550 cord.  Or keep the snap hook, and link snap hook with loop of 550 cord to either a single or double ALICE mag pouch.  Lots of configurations posible.

I don't advise carrying this many pouches on a regular basis, but if you feel the need, then go for it.  The above set-up with multiple 550 cord loops gets rid of some weight, and allows the rig to move with the user's body.

Most savvy users try to find the older ALICE harness that had a rear "H" style attachment, foregoing the inferior, more modern "Y" style of rear harness attachment.  One seldom sees aftermarket mfrs ofering 'Y" style harnesses, and there's a reason for this.

Don't worry about substituting paracord––or outdoor grade wireties–– just now.  Wear the rig, train with the rig, and figure out where everything sits well.  Make damn sure you assume ALL positions when shooting, and crawl a LOT during your gear evaluation.  Once everything's where you want it,then you can replace the ALICE clips.

This is a good point.  At this point in time, GTG ALICE clips are getting scarce.  What one finds is an increasing percentage of defective GI units, and  some foreign copies that were bogus from the get-go.

It is possible to re-habilitate some GI ALICE clips if they are are sprung open.  Just squeeze them, little-by-little until the male prong inserts into the female opening. This is something of an art, and some experience is required, so try this process with hopelessly screwed-up clips first.  

What is most important is that the ALICE clip STAYS closed, and this is entirely due to a seperate spring-loaded flap which is visible in the back of the ALICE clip.  It is a "V" shaped spring, and almost impossible to adjust.  I've tried, with no good results.  If this particular spring works well, then one can possibly get the ALICE clip to work if it is only sprung open.  If the "V" spring offers little or no resistance to the male prong being seated, then the clip is probably beyond repair.  There should be a definite "feel" to the male prong being seated in the closed position, and being opened from such.  The male prong of the ALICE clip has a hole/detent in it that the "V" spring inserts itself when the male prong is closed.  That's what keeps the ALICE clip closed.  If the "V" spring is messed-up, the ALICE clip will not stay closed.

As for myself, I generally replace ALICE clips with MALICE clips.  90% of the time, ALICE clips can be replaced by MALICE clips, and I strongly suggest doing so.

Sometimes, the pouch will not allow use of wider MALICE clip.  

No worry.  Just substitute your good ALICE clips that are displaced by MALICE clips in such an instance.  ALICE gear was intended to interface with modern PALS/MOLLE stuff, BTW.  Or use outdoor-grade wire-ties.  Or Paracord.  Or Milspec woven nylon twine.

I've asked Tac Tailor to make narrower MALICE clips.  No response.

The canvas pouches were M-1956 gear, and the nylon "Y" harness was made to have its front suspender hooks interface directly with the nylon 30-rd M-16 pouches.  Never intended to mate with M-1956 cotton gear.  An unusual example of stupidity, as most US gear is designed to be adaptible to older systems.  

There are some 4x20 rd  mag pouches out there, some being M-1956 cotton, and some M-1967 nylon.  Collectors love'em, as none were all to common.

What happened is that the Army actually designed an new, nylon, system of gear, the M-1967 system, but it was never fully adopted.  The M1967 nylon grar had 'D' rings on the front of the harness to allow older M-1956 pouches to interface.  You can find most of M-1967 gear here and there if you want to, but at that point, the Viet war was closing down, and the Wizards at Natick were beginning to focus on bigger and better things.  Such as the ALICE system.  Most of the M-1967 system of nylon gear never made it to the field.  As such, and being in mostly un-issued condition, some collectors are taking notice.