Thin hair updo help!

[TessTackle]

S&B ladies, please help!
My Dsis is getting married in a month, we bridesmaids are doing our own hair (fine I trained as a stylist) but my hair is so thin!

Any up do, especially one to the side as we've planned, looks horrible because I have about 4 strands of hair

Are there any magic doo da's you know of other than buying a packet of extensions?

Thanks

I bought a little donut, and some extra rollers (I'll be using the sets from my kit on the bride) so I'll have a play around once DD is in bed tomorrow. Also have thickening spray and backcombing brush at the ready. Thanks for all your suggestions.

ha OP i laughed at 4 strands of hair .... im exactly the same!
i had messy side bun with doughnut in when i was bridesmaid a few years back, covered fine as mine was also long.
like another poster i also have now got half head micro loop extensions, they are reasonable price & easy to apply but can be a bit of a pain!!

ha OP i laughed at 4 strands of hair .... im exactly the same!
i had messy side bun with doughnut in when i was bridesmaid a few years back, covered fine as mine was also long.
like another poster i also have now got half head micro loop extensions, they are reasonable price & easy to apply but can be a bit of a pain!!

See I don't mind the lack of thickness most days as I wear it curly/wavy and it looks decent down or in a ponytail/messy bun/plait etc it's just this bastard side up do.

Can't go for an updo at the back because I have a 5 head