interest is added to the fabric in some way, either by the type of weave /colour/or appliqué, or, fabric is enhanced in some way

see the dress here with the detail of fabric weave

http://www.ebay.co.uk/itm/womens-dresses-size-12-Dorothy-per...

here, in this example they specify appliqué
http://news.google.com/newspapers?nid=110&dat=19851026&id=Yx...

in your examples the tie is obviously interesting in its colour design and if you zoom in on the t-shirts the weave appears to be interesting giving different shades/tones of colour


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Note added at 4 hrs (2014-01-19 11:26:00 GMT)
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or in the t-shirts the blend of textile is itself interesting

50% polyester 38% cotton 12% viscose.

the 2nd t-shirt 's fabric interest is

"the Red Pocket And Textured Stripe"

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Note added at 4 hrs (2014-01-19 11:27:42 GMT)
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there also appears to be extra stitching details here when you zoom

http://hk.nextdirect.com/en/x532804s3