I`d more or less agree with Hersute there but with maybe a few extra little points/suggestion......I think firstly, there`s no point in ordering a system for this man with the standard 6-inch hair length [not that it was mentioned above] but just like to point out that it`s obvious that he`s going to have to wear his hair short to match his growing hair...can be tricky to do with systems, as it exposes the base so much to visual `scrutiny`.....3-inches would be more than enough. I`m suggesting he might possibly keep that little front bit of his growing hair [pic 1] and have the front of the system sitting immediately behind it....might be worth doing ..or he might just like to make a `clean-break` of it and shave it off....what do others think --is it a worthwhile option? In relation to colour... `1b` is ``off-black`` ...it looks `black`on first delivery [usually] and it`s what I used to wear....after a while/oxidation it is quite visible in natural light as a shade of brown.....he`d be better off going for a `1`[black] I think. I think too that he should go for a very light density for his first system..he can `step-up`on the next one BUT be aware that with such a light density, if shedding becomes an issue early on, he`ll need a replacement to hand fast ! It might be an idea to order 2 systems at the same time..one with the lighter `starter`density..this will help him `transition` without too many raised-eyebrows among people who know him. I was involved with making a template for a person last year who had a similar hair loss pattern... he went 45% for the first system [and even that needed a bit of thinning when it arrived !] but he was conscious of the `reaction`of work-colleagues etc. and also had a large up-coming social event he needed to attend, where people who hadn`t seen him for quite a while would be ---- he pulled it off very successfully. He`s since moved on to his 2nd system with higher density. By the way ,he also has black hair and was going to order `1b` until I put one of my old toppers [1b] up against his own hair..he could immediately see the colour-difference, so he want for `1`. In terms of `wave` for this potential new wearer.... I guess he`d be best to get some kind of `wave` even if it`s only body-wave but the fact that the hair will be cut pretty short will kind of `cancel`it out to a degree as it will be cut so short, but I think `straight`hair would be too `obvious` against his growing hair...so I`d order at least a body wave. In pic 2 I suggest he order a `swirl` to imitate his own natural swirl..the pics should be enclosed with the order to show the factory what he needs..... in pic 3 just a suggestion as to the area he should `take -in` with his system......I agree with Hersute too in that he should leave his sides grow out--- need not be much but a little will help with the blend-in with the system..... back to density---a 45% Toplace density is the equivalent of 60% on some `other` suppliers..... it varies and is hard to give a precise figure...I think a light density [45%] would help `ease`him into this wearing-world.
As to ventilation , hmmm, I think a forward-from-crown [swirl area] would work and also, I`d go French lace for his first one ..it`s a bit more robust than Swiss and will mean he can be a bit `rougher`with it....skin[poly] is of course another option, but is less breathable..... I think a poly perimeter would be `risky`with a light density as it could be visible through the thinner hair-density...the `line` could be obvious.
P.S. -- With any kind of thin/light density it`s essential that ALL knots are properly bleached by the factory.