Wig sizing for pukipuki, realpuki

Nope, it pretty much goes by head size, though some wigs and styles work better on specific doll head than on others. You coould try browsing Etsy for peole who make wigs specifically for RealPuki and Puki Puki, at least then the pivtures will show you how it looks on their heads. Like these sellers for example:
Author's BJD clothes BJD wigs BJD shoes by TashkasBears on Etsy
Химеринда by Himerinda on Etsy
Raewhitewolf handmade from my own imagination. by raewhitewolf

Teddy

 

I have two pukipuki, both legit, and they seem to have a slighty difference im head sizes, so much headachd

 

One is from around 2011 and the other from around 2017, I think this may have influence on this problem

 

It is not unusual to have the same "size" of bjd have slightly different sized heads (or eye openings), even from the same company and year. It's also very difficult to find a mass-made tiny wig that isn't overwhelming, since typical synthetic wig fibers don't really scale to that size (as you experienced), and often are too full or stiff for the tiniest of bjds. That's likely why the first Elfdoll tinies (who were among the first dolls in the "tiny" range and have very small heads) had saran fiber glued to their headcaps rather than wigs.

I have personally found more success with artist-made natural fiber wigs as suggested above. I was fortunate enough to be able to purchase some from Mary Sherbet (SherbetLollyDolly) before she stopped taking commissions.

 

Thats why im ventilating my own pukipuki wig with human hair, but it takes so long

 

Ventilation is a method where you use a specific needle to tie a strand of hair to the lace fabric and repeat until the wig is fully formed

You can check my Project journal to see one that I made

 

Yes, that was years ago before the tiny bjd universe took notice of her artistry. I can't imagine I'd get one nowadays.
Bulkiness has always been a challenge when making wigs for the wee set, that balance between a natural look and making sure there is coverage. I'm not familiar with silk fiber for wigs, it will be interesting to see how that comes out.

 

Marie Patterson from WeeDollyWears on Facebook also make adorable tinies wigs with baby mohair and so on, I cant afford because dollar is currently more than 5 reais, but if I could my dolls would totally wear her wigs