"He who marches out of step hears another drum." ~ Ken Kesey
We bought the 4 up pocket palettes from action, they come 3" wide but we modified the inner two on all the palettes because we are running custom made shirts that have tiny pockets. The 3" seems to work with everything else we ever used them for.
Dangle.4" can be too wide for some pockets to fit. Last time this came up I mitered down the end of a 4" sleeve platen to about 3". Worked great and I wondered why all sleeve platens aren't two sided like that.