Revision
Check the fibres shown here.  Again these are microscope images and show the shape and air-rapping potential of the fibres.  
       
The first picture (1) is of cotton and shows the characteristic ‘close-packed’ look of most plant fibres.
Harder, and coarser - and with angular edges giving rough fibres are those of jute (2)
The pleasant soft feel of cashmere wool (3) is the result of the round fibres -  whilst the thicker fibres of Marino wool (4) lead to the more durable qualities   of the fabric made from them.
What do the fibres look like in the fabric you are using ?
Year 7 ~ Thinking about Textiles ....
22 - DTOTW - Mechansims for use in mechanical toys and automata. Velocity ratios and levers introduced as a background to the theory behind simple mechanisms. Mechanical toys and Automata project - Guidance, Help and Research starting points - Resources fro students and teachers of Design & Technology at KS3, KS4 and KS5 - and beyond. Gear ratios - Velocity ratios - Driven velocity  -  Input speed  -  Output Speed  - Simple Gearing example
20 - Design and Technology help with clock design and with making the pencil box. Is it a Hardwood or is it a Softwood ? Properties and uses of timbers and ways of sawing boards and planks from trees - Year 7 at KS3 - Design & Technology On The Web
22 - DTOTW - Mechansims for use in mechanical toys and automata. Velocity ratios and levers introduced as a background to the theory behind simple mechanisms. Mechanical toys and Automata project - Guidance, Help and Research starting points - Resources fro students and teachers of Design & Technology at KS3, KS4 and KS5 - and beyond. Gear ratios - Velocity ratios - Driven velocity  -  Input speed  -  Output Speed  - Simple Gearing example
20 - Design and Technology help with clock design and with making the pencil box. Is it a Hardwood or is it a Softwood ? Properties and uses of timbers and ways of sawing boards and planks from trees - Year 7 at KS3 - Design & Technology On The Web
Once made into single threads there are several different ‘weaves’ that  used to make FABRICS.  If you look closely at  some of the materials that make up clothes you might find some of these different patterns into which the threads have been woven
Whilst you are making your products examine the material you are using under a magnifying glass.  What do the fibres look like?  
They will be woven in and out of one another to make the material you are sewing together but look closer.

Look at this picture here.  It is one strand of wool seen under a microscope. Notice that there are a lot of spaces. These all trap air between them and it is this trapped air that makes wool so warm in winter.
Wool
Silk
Flax
Cotton
Some interesting historical views on textiles and their production
Plain
Twill
Basket
Textiles and their Features
1
2
3
4
sheep-medieval.pdf
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