Bloomie, you take the image you want to overlay, then you crop out the part you want to overlay using the polyganol lasso tool (in this case it was the jacket) then go into the image you want to use as a "base" (the shirt) and hit paste. Make sure the layer with the jacket is selected, then use free transform (ctrl + T) to manipulate the jacket layer to fit. The end!
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"...If I know my supermodels (and according to the half-dozen or so draped across my bed in a jenga of crack-glazed longing, I certainly do)"
First off, that shirt is GREAT!!! But no, not with that jacket...do you have a regular jean jacket??? I think that would look cute :) Eithr way you will look great in that shirt....great taste!!
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"Life is not measured by the number of breathes we take, but by the moments that take our breath away"