"Under the Sea" costume HELP!

[Netix]

Towards the end of next month, dd will be going to a 6th birthday party, themed "under the sea", and guests are invited to dress to the theme, or, failing that, just in blue.

I have no sewing machine, and hand sewing skills that extend as far as sewing together torn jeans.

I have no idea what to dress dd as, thought a mermaid, but.... How to do the costume??? And the library is closed until Monday, and I anticipate I could be in hospital then anyway. Thought of looking through books while I'm in there.

Can anyone make some suggestions? My Mum suggesting buying a costume, but honestly! What is the point, for a one off, and for a 'topic' that dd has no real interest in? I am happy to try and make something, just not sure what or how. I love scouring our op shops for bits and pieces to use. On top of that, my phone is my only internet access unless I go to the library (which is limited to 1 hour access per day), so haven't the time to trawl through countless web pages. So, looking for suggestions, specific sites/blogs, anything, PLEASE!

Counting on you, my creative bb sisters! Help me out please! Many thanks in advance:

[Mother Goose]

An Octopus? A belt with old pantyhose stuffed with newspaper to fill. Then you can papermache the outside and paint an appropriate colour and wear pants/top in the same colour...

Green seaweed. Wear green and pin green streamers to the clothes.

Starfish - can be any colour. Two large pieces of cardboard cut in the shape of a star and then some string at the top to make a frame type thing to just hang over head to sit on shoulders...

[Sunny Love]

She coud wear a sparkly skirt for a mermaid tail, any colour you like and with its of sequins (im thinking opshop and material cut offs), with a black top and a VERY extravagent mermaid crown that you made together

[Tinks]

A Mermaid? she could wear her bathers and you could make a tail out of shiny fabric.

[Netix]

BRILLIANT IDEAS! Thank you! Tinks; another thing I just remembered about the mermaid, its going to be pretty cold, so long pants will be in order, so maybr not bathers.... :/

[Beach Mama]

Navy and white clothes - sailor girl???

[Liviam]

I did a blue ring octopus for DD. I used a blue swimming ring & hung 6 knee hi panty hose stuffed with newspaper and I drew blue rings on them. I dressed her in blue clothes.

Good luck