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Light, unobtrusive makeup is acceptable.  It's not prohibited or required ... just allowed and just like everything else should be subtle and moderate.

I follow what the saints teach, so. . . No makeup.

There's a consensus of the saints on the issue.

That is my method. What they agree upon, that is the way.

I know it's hard to change, but we can always begin anew.

'For what the body loses the soul gains, and what the body gains the soul loses.'

St. Jean Marie Baptiste Vianney, the Cure of Ars

What should a woman in her late 20s wear to go to Mass? What should she wear specifically in terms of makeup, clothes etc?

In aother words what would be appropriate?

I wear skirts or dresses that fall at least just below my knees.  In the winter I wear full length because I get cold.  

I have all sorts, mostly skirts.  Some dresses these days are very tight fitting especially about the buttocks.  So one must be quite careful, IMO.

A slim form fitting dress, even if it is knee length, can be quite immodest.

I do not wear form fitting blouses, either, and I wear a sleeveless t-shirt underneath.

I wear low heeled or flat heeled shoes.  

I do not mostly wear black.  

I don't not wear jewelry any more.  I do have a set of pearl earrings and necklace that my husband gave me for Mother's Day a few years ago.  I find that quite acceptable, but dangling earrings and big baubles seem flashy to me.   IMO, simple is elegant.  

A wear only a small amount of makeup when I go to Mass.  During the week, I do not wear any at all unless I have an appointment.

I think women can dress modestly without looking like they are in mourning.  

Most of the women dress the way I do.  Some of the young girls wear low cut blouses occasionally, but most do not.

In winter, I wear a hat.  In warm weather I wear a lace mantilla.  I do have others that I made which are not lace, but I think some of those look like bandanas and I prefer to wear my finest to Mass.

Women often struggle with their vanity.  Even little girls want to wear pretty mantillas.  This is an area where many can become scrupulous, IMO.