I know a bit about that kinda stuff - it doesn't look like a lace system yet, but he'll probably go for that when he gets more bald.
Guys can get stuff to attempt to camouflage the baldy bit so he's either used the coloured spray, the fibres or the compacted stuff.
The aerosol things come in different shades but unless the guy is very lucky, they are never an exact match and they end up with a kind of two-tone head. Likewise dying the remainder of their own hair to match the product is also tricky.
The fibres are literally sprinkled on and combed through [with a special comb that looks like those used to search for head lice] to give the appearance of thickness at the root - and again, getting the exact colour is tricky, and of course the fibre sprinkles can't hide a bald patch which is where the spray is used or there's another thing that comes in a pot and it looks like Blusher and that is applied to the bald bit on the scalp - and again, getting the right colour is tricky.
Then once the bald patch gets bigger and the hair around it gets thinner, the guy usually goes for a lace or a membrane system.
They're not like the toupees or wigs of old, they are more realistic.
The lace once is literally a lace 'skullcap' upon which real hair is woven and the membrane system is a skin-coloured very thin membrane upon which real hair is somehow attached. That one looks like real scalp and is barely detectable.
Because real hair is used for these, the wearer has a piece of their own hair taken by the manufacturers and they dye the hair systems to match.
They are widely used in TV and Film so, obviously, Meghan will know all about them.
They have to be replaced and cleaned often and run very expensive which is why its mainly Hollywood actors and wealthy TV stars who have them because they can afford to have them done so frequently.
Looks like Harry has started the first stage of colouring in the gaps and a system will be next.