These are the instructions I followed in making a template...https://translate.google.com/translate?sl=ru&tl=en&js=n&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.liveinternet.ru%2Fusers%2F4751152%2Fpost253337107%2F .... (they are not complete, but assume you have a basic boot pattern or knowledge...it is additional info for shaping around ankle) I used this for my ugg boots/slippers that I wear inside...and this does not have allowances for an eyelet opening and tongue at front...don't be put off...making the tongue allowance is not hard...just add that extra to the front of your template...eg if the tongue is going to be 4cm then add half this measurement to the front....this is a boot tutorial I have seen many times although I have not used it... feltmagnet.com/textiles-sewing/Wet-Felted-Boots-Master-Class-Tutorial . I feel a bit bad because neither of these are how I make my template...how Natalya taught was different again...and what I am doing is tweaked again...but my own instructions are written in a notebook in code (my handwriting!!!) and even I can't understand it sometimes. But for those wanting to make boots I think both those sites are a good place to look to gain some knowledge...failing that...sign up and do one of Natalya Brashovetskaya 's workshops!!!...she is an excellent tutor and you can be confident you will learn how to make beautiful boots (she has some unique techniques she has developed and has intellectual rights to that I can't share...but these are to do with the soles not the template)...I'm happy to help by answering any questions if you get stuck.
As well as these measurements I take the widest part of the foot...and have been playing with an additional measurement that takes the height of the arch...nothing very specific in my approach...I have very high arches and my 1st boots needed stretching to allow for this ... I stood on an insole and measure around foot and insole (measuring just my foot does not show how high it rises)..yet to make another pair for myself to see how this actually works.... there are only so many boots I need!!!!
after note on my alterations of my template for a higher arched foot: While I have made my template a little wider around this part of the foot, by far the best alteration has been to 'sculpt' an wedge of polystyrene that I slide into boot that sits on the arch area of foot/last. I then shape the boot around this last plus wedge combo...getting great fitting boots now