It still has ten sides, same as a normal decagon. "Irregular" simply means that all the sides and angles of the decagon are not congruent.
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A regular decagon has 10 equal sides.
Any polygon is regular if its sides are all the same length, or irregular if they're not. If all 10 sides of your decagon are the same length, then you have a regular decagon. If they're not, then you have an irregular one.
A decagon has 10 sides
A regular decagon
You just call it a decagon. If all the angles and sides are equal then it's a regular decagon. If not, it's an irregular decagon.