Is it possible to wear glasses and hair at the same time? Or hair and beard? Two pairs of hair (seen people)? Is the matrix about this? I would be grateful.

Idk about that
but it is allowed to use a hair item and a head item at once
Like for exsmple: blindfold and spikey

Yes you can like i have a beard and swag cap on but i could also put on candy locks and a Santa beard just as long as the two don't over lap it will be and look fine.

I know, but not always. BUMP.
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Who knows everything: do matrix plz

you can wear 1 hair item and a 3d item at the same time..

However you cant wear two 3d items for the same bodypart at once
you can do it with hair items (i believe) but you have to do a little glitch here

pretty sure this glitch works only for hair item and not 3d item

you can wear multiple hair items doing the glitch mentioned above, but you can only wear one 3d obj for each body part
meaning you can wear multiple hairs and a 3d head obj
though if you put too many hairs on, they will glitch and some of the hairs will look weird (balding)

1 hair + 1 3d item = guaranteed to work

Depending on which of the 15 segments are used in hair items you may be able to combine them, though it's purely trial and error since no one has spent the time to test which ones work together