What kind of jeans will make my legs look longer/skinnier?

Ok so my friend says skinny jeans will but when i wear skinny jeans it looks like it makes me look fatter and shorter. So my other friend says flare jeans/bootcut will help...
Update: I'm not really fat. I'm 5'4" and i weight about 110 or so, but i have short legs/kinda big hips.
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